who rebuilds 901 transmissions in the Detroit area or..

[chatas17]

I pulled my transmission out last night and it appears that the input shaft (from the shifter linkage) is binding and not allowing me to separate the housing from the intermediate plate. Any ideas if this is common? Any ideas who rebuilds them and a range of cost. Is it better for me to find a good used one to put in and save the trans for a future owner? While I'm at it, any sense converting over to a 5spd? Do I have to switch over a lot of things for that to occur? BTW.. all the gears are in good working order. Usual consistent wear but nothing on the bottom of the case (teeth, etc.)

Thanks for any help!
Jim

[Grady Clay]

Jim,

Put the transmission in 5th gear.
Make sure the main shift rod is free (flopping about).
The intermediate plate and gear cluster should slide right out.

You can DIY a 901 easily.
What are the symptoms?

Best,
Grady

[chatas17]

I was driving home from work and the car became stuck in third gear. I was about a block away so I drove it home. I did manage to get into first gear and then in reverse. I can't get it out of reverse and the input shaft (opposite end of the engine) will not move what so ever. I did move the one lever fork (that moves one of the shafts) and I can get the transmission into neutral. Everything inside looks good. A little worn but no apparent damage. Can that shaft bend? It's pretty stout. This is a 4 speed transmission.. Not sure that makes a difference? Can I put in a 5spd without modificaitons? New shifter?

Thanks for the help.
Jim

[Mark Henry]

I just turned my 4 speed into a 5 speed....but you need another core to do this.

[djpateman]

What is the type # and serial # of the transmission? There are a few guys this side of the border that I know that could help.

[tab tanner]

I sent you a P.M. about your transmission, I'm not that far away and would like to help!!

[Grady Clay]

Tab,

Mark is exactly correct above, it is easy if you combine your 4-speed with a (somewhat decrepit) 5-speed. This way you use the necessary parts from the 5-speed and you can use the best parts from both to build the best transmission. You will need some new parts.

You can help pay for this by selling your 4-speed 2nd gear and 3rd gear pairs to racers. These are desirable for gearing a race transmission to a particular track.

You have plenty of help on the Forum for you to DIY. You also seem to have some good ‘in person’ local help.


Back to your 4-speed.
It sounds as if you may have a shifting issue external to the transmission.

While you have the gear cluster out, make sure each gear engages and disengages properly. One-at-a-time engage each sliding sleeve to each gear by fingers. Are they all the same ‘feel’?

Reassemble the gears and shift rod in the transmission and install the nose piece. Using the shift coupler from the car, shift in and out of all the gears. Does everything operate properly? Remember, you may have to rotate the gears while shifting for smooth operation.

Hopefully you have retained a sample of the shim gaskets between the intermediate plate and the main casting. This is necessary to maintain the proper pinion depth position and correct R&P clearances.

Best,
Grady

[kach22i]

I know this sounds too simple, but did to inspect your shift coupler and make sure the setting screws did not fail (or some other linkage issue).