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Index > Engine/Drivetrain > Thread: Transmission mount
Thread: Transmission mount
spokanerxdude


Hauling
Less cubes... More balls
Posts: 180
posted May 22, 2015 09:21 AM

Transmission mount

So here is my problem, I'm putting a stock 76 repu tranny into a 74 repu and can't get things to line up. Is there a difference in the mounts between the years? The mount is to far back kinda like an FB tranny, I even tried a modified for an FB mount and it won't work eather, holes are to far back. I'm kinda stuck in the middle, LOL. For now I'm just going to elongate the holes in the FB modified mount to get things going
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Allen Ervin, spokanerxdude@yahoo.com
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Brad


Rotorhead
Posts: 1665
posted May 22, 2015 05:51 PM

Sometimes ya just gotta wing it.

       
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nwaco


Redlining
Posts: 407
posted May 22, 2015 10:03 PM
Edited By: nwaco on 22 May 2015 22:04

It should fit...

If the transmission is a ribcase with separate bell housing, it should fit. Are you sure it is an original 76 tranny?

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spokanerxdude


Hauling
Less cubes... More balls
Posts: 180
posted May 23, 2015 04:29 AM

quote:
Sometimes ya just gotta wing it.


yup, LOL you do.
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Allen Ervin, spokanerxdude@yahoo.com
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spokanerxdude


Hauling
Less cubes... More balls
Posts: 180
posted May 23, 2015 04:42 AM

quote:
If the transmission is a ribcase with separate bell housing, it should fit. Are you sure it is an original 76 tranny?


I beleave so, it was in the 76 when I got it and the mount fit in that truck. Is the bottom of the stock tranny slanted to one side instead of flat?

I also saw somewhere that the gear oil is and old style, because the new stuff eats the syncro rings, if so what type oil am i looking for? Just something I read recently and can't find again.
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Allen Ervin, spokanerxdude@yahoo.com
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Brad


Rotorhead
Posts: 1665
posted May 26, 2015 08:58 AM

quote:


I also saw somewhere that the gear oil is and old style, because the new stuff eats the syncro rings, if so what type oil am i looking for? Just something I read recently and can't find again.


The old school and 1st gen rx7 transmissions use brass synchronizer rings and their oil spec is GL-4. Newer gear oils eat brass. So you want something that is specifically GL-4. Not one that is 'compatible with newer and older transmissions'. It is hard to find, but:

Sta-Lube makes a GL-4 oil, you can get it from NAPA auto parts. Also Redline Oil makes a MT-90 that is phenomenal.
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-brad-
74 REPU Lawn Green
81 Rx-7 racecar. 12a J-
Bridge

       
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spokanerxdude


Hauling
Less cubes... More balls
Posts: 180
posted June 01, 2015 04:51 AM
Edited By: spokanerxdude on 1 Jun 2015 04:54

Thank you Brad, I knew there was something about the gear oil just couldn't remember the spec for it.

As for the tranny mount had some time to look at both trucks this weekend and noticed that the 76 has two sets of mounting holes on the frame mounts, so I'm assuming that one is for the 5 speed and one is for the 4 speed. Anyway the 5 speed is 3.5cm further back and the bolts(tail shaft) hit on the tranny cross member so using the Rx 7 modifed cross member won't work; did some measuring and put together a plan to build a mount. Now it's just a matter of time and money.
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