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-   -   Manual Trans Mounts: Using 78 mounts in a later car (https://rennlist.com/forums/928-forum/1122856-manual-trans-mounts-using-78-mounts-in-a-later-car.html)

Hold On 01-07-2019 06:04 PM

Manual Trans Mounts: Using 78 mounts in a later car
 
Throwing this out for comments.
I have a 83 S with a 79 manual trans setup. Its time for fresh transmission mounts. The 79 up mounts 928-375-045-16 are god awful expensive, over $200. each. The 78 mounts are two different widths but a fraction of the cost, under $100. each. The reason they are different widths is because the 78 have a different battery box setup. I have heard that the 78 mounts can be used in the 79 setup as long as I use the two wider width mounts ( 928-375-045- 13) on both sides.

Has anyone ever confirmed this ? I did some searching but did not come up with a conclusion.

Thanks.

Mrmerlin 01-07-2019 07:16 PM

Ok your on.
Please post pictures of the mounts you have,
and where they have to fit,
and order a set of what you think you need.

Maybe your going to teach everyone something here about trans mounts.

Hold On 01-07-2019 08:53 PM

I havn`t pulled anything apart yet. I was hoping someone may have done this mount swap before. Before I purchase parts. The manual trans and cross member are stock 1979 parts. Those mounts are #928-375-045-16. Both sides are the same because the battery box mount was changed in 1979. The 78 has two different widths of the same mount. I will keep searching here. I swear I saw someone who did this mount swap.

Mrmerlin 01-07-2019 10:22 PM

Please post some pictures , talk is cheap, LOL

Hold On 01-07-2019 10:42 PM

Pictures of what ?? If I cant confirm it`s been done, I will order the one`s needed...

Hacker-Pschorr 01-08-2019 09:46 AM

I changed the thread title to better reflect what you are asking. If my 78 wasn't mothballed I'd climb under there and take some measurements compared to my 79 (which is already on the lift).

I sent a message to Mark Anderson, if anyone has a set of each lying around, he might. See what we can figure out with this idea.


Originally Posted by Mrmerlin (Post 15549271)
Please post some pictures , talk is cheap, LOL

Seriously Stan?

Mrmerlin 01-08-2019 10:08 AM

Eric thats why I added the LOL.
This is an obscure request and without any pictures to go on it could turn into a cluster

I want to assist the OP but I dont recall the differences he is looking for ,
and adding pictures of the mounting area he has and the mounts will assist in a more accurate answer
Off the top of my head I dont know anyone that could answer this question from memory
Though Mark Anderson is a good idea where to start
For the OP look in the WSM as it details the changes that were made to the rear crossmember and trans mounts as the model progressed
This might include mounting designs.

Guy 01-09-2019 10:40 AM

I installed the wider 78 mount on both sides of my 79.

https://rennlist.com/forums/928-foru...h-shudder.html

worked great!

Hold On 01-09-2019 11:08 AM


Originally Posted by Guy (Post 15553022)
I installed the wider 78 mount on both sides of my 79.

https://rennlist.com/forums/928-foru...h-shudder.html

worked great!

Thanks for chiming in Guy. That was the post I remember seeing a while back. Now that you have some miles on the mounts, what`s your current opinion on the swap? They are certainly hefty mounts.

z driver 88t 01-14-2019 10:09 AM

This is a great thread. I am in the market for new mounts and was lamenting that it was going to be $400 for a set. Damn, those are some BIG transmission mounts.

Guy 01-14-2019 10:16 AM


Originally Posted by Hold On (Post 15553091)
Thanks for chiming in Guy. That was the post I remember seeing a while back. Now that you have some miles on the mounts, what`s your current opinion on the swap? They are certainly hefty mounts.

I would do it again in a heartbeat my shifts are solid and firm and the car is smooth as silk.

ROG100 01-14-2019 11:38 AM

Unless you have bought the 928 375 045 13 already they are currently not available and maybe NLA.

Mark Anderson 01-14-2019 01:10 PM


Originally Posted by ROG100 (Post 15564829)
Unless you have bought the 928 375 045 13 already they are currently not available and maybe NLA.

We have 1 left

ROG100 01-14-2019 01:20 PM

Cue the Meme - $1000000 dollars.

Rob Edwards 01-14-2019 01:27 PM

https://webfiles.uci.edu/redwards/pu...%201-14-19.jpg


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