John McGraw

Does anybody know what the difference between a 3 speed and a 4 speed trans mount strap?

I am restoring a 57 right now, and the trans seems to be sitting high at the rear mount. The car has a 4 speed in it, bu the car is too early to have been built with a 4 speed. I am thinking that maybe the 3 speed mounting strap is taller than the 4 speed mounting strap, and that maybe they did not replace the strap when they installed the 4 speed.


Regards, John McGraw

DZAUTO

I'm not aware of any kind of strap that is used to mount the transmission in a 53-62 Corvette.
There should be a cross member attached to the X-member with 4 bolts.
There is a rubber mount inside a mount bracket which attaches to the cross member with 4 smaller bolts.
The 53-61 cars had another bracket attached to the rubber mount and to the mount pad on the bottom of the transmission tail housing with 2 bolts.

For 1962 ONLY, the 4sp mounting was slightly different.
There was a plate with 4 holes which attached tot he mount pad on the bottom of the tail housing and then to the rubber mount.
This is how the 62 transmission mount is assembled.


The 53-61 cars have the mount pad further back on the tail housing, thus, they use a different plate for attaching the tail housing to the rubber mount.

This tail housing has 2 mount pads, one (short) for the 57-61 style mounting, and one for 62-later mounting.



I can't find a picture of the plate for the 57-61 style 4sp mount.

Pilot Dan

John, if you are talking about the transmission MOUNT possibly, the 3 spd is a bit taller than the 4 spd. Otherwise, as Tom said, I am not aware of any "strap" that was ever factory installed. Pilot Dan

JohnZ

Possibly John means the 3722948 "bracket" with a double-bend on each end between the trans extension housing and the rubber-cushioned enclosed "puck" mounts on the crossmember...

56Heap

Paragon list a #831 for a 3 spd and #525 for a 4 spd. The 3 spd bracket looks like it is taller than the 4 spd bracket

John McGraw

John,

You are absolutely correct! The catalogs have a different number for each application, but I do not know if it hole location or height of the bracket. My tail shaft seems to be sitting too high, and I was just wondering if the 3 speed bracket was taller, maybe the previous owner reused the 3 speed bracket rather than buying a new bracket. If nobody has a definitive answer, I will probably just buy a 4 speed bracket and return it, if it is the same height as the one I have.



Regards, John McGraw

John McGraw

Rob,

That is what it looked like to me as well, but I was just hoping somebody knew for sure.



Regards, John McGraw

AZDoug

You know, you can call them up and ask them to measure the part for you.

You do remember what a phone is, no? (sorry, seems people are so addicted to their internet, everybody wants to do stuff online rather than talk to a person)

I have done this before and vendors in general will take the time to make sure the part you get is what you want, rather than hassle with shipping out something and then having to restock it.

Doug

DZAUTO

I MUCH PREFER talking on the phone because I feel I get a more complete answer and information to my question. Besides, we have 21 phones throughout our house and MOST of them are OLD and have a rotary dial (I have a granddaughter who will not use a rotary dial phone because she doesn't know how to dial on one!!!).
Another grandson never saw a phone with a wire coming out of it.

John McGraw

Well, it was a weekend, and I figured that maybe someone on this forum would be knowledgeable about the bracket differences. I guess I was wrong!

I will go by my friends house and measure his original 4 speed bracket and that will tell me what I need to know. Sorry to bother everyone with my silly-assed question. I thought that this was one of the main functions of the forum!


Regards, John McGraw

JohnZ

John, I restored my 57's back in the early 90's - both were original 4-speed cars and I never had to dope out the trans mounts, so I couldn't offer anything about any differences between the 3-speed and 4-speed brackets.

John McGraw

John,

I went over to a buddies house this evening and measured an original 4 speed bracket, and my suspicions were confirmed. The bracket was much taller, so it must have been the original 3 speed bracket. Ordered a new bracket. Thanks.



Regards, John McGraw