 Lost 4th & 5th Gears, where do I start to troubleshoot? |
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| Rick986 |
 Jul 21 2022, 10:31 AM
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#1
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0-60 in 14 seconds!  Group: Members Posts: 141 Joined: 31-August 21 From: NE Ohio Member No.: 25,869 Region Association: Upper MidWest 
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Been noticing a challenge getting it into 4th for about a week in my '75. Now, fully impossible. Where do I start looking first? Thanks.
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Replies(1 - 19)
| flipb |
Jul 21 2022, 11:01 AM
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#2
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Senior Member Group: Members Posts: 1,771 Joined: 2-September 09 From: Fairfax, VA Member No.: 10,752 Region Association: MidAtlantic Region
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Trace the shift linkage rod from the firewall to the shift console on the transmission. Check for loose play, worn/missing bushings, or damage to the rod itself. Mine once separated where the rear half could rotate freely from the front half.
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| emerygt350 |
Jul 21 2022, 12:17 PM
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#3
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Advanced Member Group: Members Posts: 2,514 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
While you are down there, check the cone screw right under that big boot on the firewall. I finally put the 'super locktite' on mine. Every 4 months it would wiggle loose and the stick would get sloppy.
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| NARP74 |
Jul 21 2022, 12:26 PM
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#4
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Senior Member Group: Members Posts: 1,300 Joined: 29-July 20 From: Colorado, USA, Earth Member No.: 24,549 Region Association: Rocky Mountains |
Check both cone screws while you are at it. Careful with the strong (red) loctite. The head can strip out before the threads break loose. New ones are suggested.
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| Dr Evil |
Jul 21 2022, 12:32 PM
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#5
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Send me your transmission! Group: Members Posts: 23,034 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region
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Check universal joint at fire wall, cone screws as stated. Check for anything interfering in the inside tunnel as that is where the guide tune for the clutch is. If all in good shape, disconnect linkage at trans and see if you can shift it by hand. If not, the problem is likely internal. Fork bolt may have come lose. The good news, this is an easy fix if internal and I can walk you through it.
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| NARP74 |
Jul 21 2022, 02:13 PM
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#6
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Senior Member Group: Members Posts: 1,300 Joined: 29-July 20 From: Colorado, USA, Earth Member No.: 24,549 Region Association: Rocky Mountains |
I have also heard longer seat belt bolts on one side of the tunnel can interfere but I don't remember what gate they mess with.
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| Rick986 |
Jul 21 2022, 02:30 PM
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#7
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0-60 in 14 seconds! Group: Members Posts: 141 Joined: 31-August 21 From: NE Ohio Member No.: 25,869 Region Association: Upper MidWest
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Thanks guys. Got her up on the lift now and am investigating!
Rookie question though - if it's something in the tunnel, how do I get in there??? |
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| NARP74 |
Jul 21 2022, 02:31 PM
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#8
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Senior Member Group: Members Posts: 1,300 Joined: 29-July 20 From: Colorado, USA, Earth Member No.: 24,549 Region Association: Rocky Mountains |
Is the R & 1 gate all the way up or down in back at the transmission end?
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| Rick986 |
Jul 21 2022, 02:32 PM
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#9
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0-60 in 14 seconds! Group: Members Posts: 141 Joined: 31-August 21 From: NE Ohio Member No.: 25,869 Region Association: Upper MidWest
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QUOTE(flipb @ Jul 21 2022, 11:01 AM)  Trace the shift linkage rod from the firewall to the shift console on the transmission. Check for loose play, worn/missing bushings, or damage to the rod itself. Mine once separated where the rear half could rotate freely from the front half. Hey Flip - define "loose play". I can totally move that rod back & forth by hand. I assuming it's supposed to move that freely??? |
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| Rick986 |
Jul 21 2022, 02:36 PM
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#10
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0-60 in 14 seconds! Group: Members Posts: 141 Joined: 31-August 21 From: NE Ohio Member No.: 25,869 Region Association: Upper MidWest
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QUOTE(NARP74 @ Jul 21 2022, 02:31 PM) Is the R & 1 gate all the way up or down in back at the transmission end? Hi - could you please clarify? It shifts into R and 1-3. I took the linkage cover off at trans and everything looks connected there...but the play is really loose. This is my first time looking at this issue and not sure how much play is expected! Any additional info would be great! Thanks in advance. |
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| NARP74 |
Jul 21 2022, 02:39 PM
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#11
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Senior Member Group: Members Posts: 1,300 Joined: 29-July 20 From: Colorado, USA, Earth Member No.: 24,549 Region Association: Rocky Mountains |
QUOTE(Rick986 @ Jul 21 2022, 02:36 PM) QUOTE(NARP74 @ Jul 21 2022, 02:31 PM) Is the R & 1 gate all the way up or down in back at the transmission end? Hi - could you please clarify? It shifts into R and 1-3. I took the linkage cover off at trans and everything looks connected there...but the play is really loose. This is my first time looking at this issue and not sure how much play is expected! Any additional info would be great! Thanks in advance. R & 1 will be at one level, 2 & 3 will be in the middle, 4 & 5 will be at the other end in the back at the trans. I can never remember which is upper most and which is lower on the rod into the transmission. |
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| Rick986 |
Jul 21 2022, 03:18 PM
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#12
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0-60 in 14 seconds! Group: Members Posts: 141 Joined: 31-August 21 From: NE Ohio Member No.: 25,869 Region Association: Upper MidWest
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Pulled the boot cover back at firewall and this fell out. What is it and where should it go?
And what are these "cone screws" you guys are referencing? Thanks guys! Attached image(s)  
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| Rick986 |
Jul 21 2022, 03:43 PM
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#13
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0-60 in 14 seconds! Group: Members Posts: 141 Joined: 31-August 21 From: NE Ohio Member No.: 25,869 Region Association: Upper MidWest
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Sorry I'm being lazy! I'm doing my homework and see the piece that fell out is the bushing from the coupler! And I think the one on the other side is gone completely. Checking...
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| Dave_Darling |
Jul 21 2022, 03:50 PM
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#14
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914 Idiot Group: Members Posts: 15,063 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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QUOTE(Rick986 @ Jul 21 2022, 02:18 PM) And what are these "cone screws" you guys are referencing? Thanks guys! See the Allen-head fastener in your second pic? That is the cone screw. Or rather, one of them. The other screws in through the shift rod head that goes on the rear end of the rear shift rod, hiding up above the plastic boot on the side of the transmission. --DD |
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| Rick986 |
Jul 22 2022, 07:07 AM
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#15
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0-60 in 14 seconds! Group: Members Posts: 141 Joined: 31-August 21 From: NE Ohio Member No.: 25,869 Region Association: Upper MidWest
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QUOTE(Dave_Darling @ Jul 21 2022, 03:50 PM) QUOTE(Rick986 @ Jul 21 2022, 02:18 PM) And what are these "cone screws" you guys are referencing? Thanks guys! See the Allen-head fastener in your second pic? That is the cone screw. Or rather, one of them. The other screws in through the shift rod head that goes on the rear end of the rear shift rod, hiding up above the plastic boot on the side of the transmission. --DD Yes, I figured that out. Thanks Dave. Really appreciate everyone's help here! I ordered a set of brass bushings and new screws yesterday. Hopefully that fixes the problem. |
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| DRPHIL914 |
Jul 22 2022, 07:21 AM
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#16
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Dr. Phil Group: Members Posts: 5,810 Joined: 9-December 09 From: Bluffton, SC Member No.: 11,106 Region Association: South East States
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QUOTE(Rick986 @ Jul 22 2022, 09:07 AM) QUOTE(Dave_Darling @ Jul 21 2022, 03:50 PM) QUOTE(Rick986 @ Jul 21 2022, 02:18 PM) And what are these "cone screws" you guys are referencing? Thanks guys! See the Allen-head fastener in your second pic? That is the cone screw. Or rather, one of them. The other screws in through the shift rod head that goes on the rear end of the rear shift rod, hiding up above the plastic boot on the side of the transmission. --DD Yes, I figured that out. Thanks Dave. Really appreciate everyone's help here! I ordered a set of brass bushings and new screws yesterday. Hopefully that fixes the problem. @Rick986 i saw this late last nite, just getting some time this morning to log on and give you some info and advice, You are on the right track, this is what happens that bushing will look just fine and then it just crumbles. Its not all gone so you have some leverage to get some gears but it hast to be pulled and replaced. I have some pictures i posted on my build thread from doing this about 2 year ago. i had the same senario . I did the brass bushings for the shift coupler bushing i think thats the best way to go. you also ordered the new cone screws, but i also would recommend the new brass bushing for the shift console and the new plastic cup that goes on the console coupler and i would do a new firewall bushing, you dont want to do this 2 or 3 times. Get a new console cover as well. 914rubber has most of those parts, but Rich at 914werke , he is a member here too and has some cool parts, has a brass console bushing, and Rick at RIX914parts.com or Chris Foley at Tangerine Racing both have a version of a better firewall bushing. Tangerine version is big and beefy more for racing. you will find lots of infor use the search function here to look this up . if i have time i will post a few links for you. you will completely remove your shift bar by removing that cone screw at front and back, pull that cover off the console and the one at the fire wall- get new ones, pull the bar out and you will have to press out the metal pin that holds the coupler on the end of the bar. DO NOT HAMMER IT. you will mar it and it wont come out or go back in , you have to press it out and press it back in . it has several splines and its not perfectly cylindrical that is so it will stay in once pressed into place. Good luck - get those other new parts ordered today, Phil |
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| DRPHIL914 |
Jul 22 2022, 07:27 AM
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#17
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Dr. Phil Group: Members Posts: 5,810 Joined: 9-December 09 From: Bluffton, SC Member No.: 11,106 Region Association: South East States
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here are a few links
https://www.rix914parts.com/store/c2/Exclus...ix914Parts.html https://914werke.com/shop/ols/products/side.../v/SHF-ROD1-BRN https://914rubber.com/side-shift-cover-sealing-sleeve-1 https://914rubber.com/side-shifter-housing-cover-1 this one is for Tangerine ahd he has a full shift system but the firewall bushing is really stout, the rear console modification with take the slop and looseness out of your shifting, http://www.tangerineracing.com/shiftlinkage.htm |
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| ndfrigi |
Jul 22 2022, 08:04 AM
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#18
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Advanced Member Group: Members Posts: 2,960 Joined: 21-August 11 From: Orange County Member No.: 13,474 Region Association: Southern California
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QUOTE(Rick986 @ Jul 21 2022, 09:31 AM) Been noticing a challenge getting it into 4th for about a week in my '75. Now, fully impossible. Where do I start looking first? Thanks. http://914world.com/bbs2/index.php?showtopic=56765  |
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| DRPHIL914 |
Jul 22 2022, 08:41 AM
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#19
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Dr. Phil Group: Members Posts: 5,810 Joined: 9-December 09 From: Bluffton, SC Member No.: 11,106 Region Association: South East States
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QUOTE(ndfrigi @ Jul 22 2022, 10:04 AM) QUOTE(Rick986 @ Jul 21 2022, 09:31 AM) Been noticing a challenge getting it into 4th for about a week in my '75. Now, fully impossible. Where do I start looking first? Thanks. http://914world.com/bbs2/index.php?showtopic=56765 there ya go, thanks @ndfrigi |
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| dr914@autoatlanta.com |
Jul 22 2022, 10:44 AM
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#20
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914 Guru Group: Members Posts: 8,110 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
yup new delrin coupler bushings should fix you right up!
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