M21????
Thread Starter
Le Mans Master
Joined: Jul 2001
Posts: 6,252
Likes: 2
From: Silicon Valley Kalifornia
M21????
Anyone know of a way to swap in a Muncie M21 tranny into a C4 (85)????? My Richmond is very nice but the gear hum is starting to get on my nerves. Any help appreciated. :chevy
Thread Starter
Le Mans Master
Joined: Jul 2001
Posts: 6,252
Likes: 2
From: Silicon Valley Kalifornia
Re: (scorp508)
The 4+3 transmission available in 84-88 was based off of a Borg Warner Super T-10 four speed. Since BW took over Muncie, I would think it would be an easy thing todo.
Pro
Joined: Jan 2001
Posts: 681
Likes: 2
From: Newton (Wichita Area) Kansas
Re: (GRX)
Yeah, I think the C-beam issue will put a kink in that plan. Richmond made a special tailshaft housing for the 5spd & 6spd in order to accomdate the C-beam. I don't know if the Muncie's are at all related to these boxes, kinda doubt that. Anybody have first hand knowledge?
If you wanna switch back to the 4+3 I'm ready and willing to swap transmissions with you. I'll even do all the work! :)
[Modified by jmr302, 1:43 PM 5/6/2002]
If you wanna switch back to the 4+3 I'm ready and willing to swap transmissions with you. I'll even do all the work! :)
[Modified by jmr302, 1:43 PM 5/6/2002]
Thread Starter
Le Mans Master
Joined: Jul 2001
Posts: 6,252
Likes: 2
From: Silicon Valley Kalifornia
Re: (TIMSPEED)
Yeah, the gears are 'straighter' cut than stock street applications. I was considering welding up a bracket that could bolt up a muncie with the C beam. Maybe attach it at the typical crossmember mount area and maybe pick up 2 bolts mouting at the bellhousing. ....or even custom weldup a steel C beam that could mate between the Muncie and the rear end?
Any ideas?
Any ideas?
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Melting Slicks
Joined: Aug 2001
Posts: 2,516
Likes: 0
From: Lockport NY
Re: (GRX)
I think you've got the right idea here. Maybe a couple pieces of ~8" long 1/2" Black Standard pipe for the c-beam bolts, welded to a 1/2" thick solid (no rubber mount) steel strap to fit the Muncie rear trans mounting bosses. Cut a triangle-shaped piece or two to weld into the 90* angle these other pieces make, and you've got that nailed.
Adapt the C4 shift rods to fit the Muncie shift arms. Should be easy. I even have a complete C3 shifter I'll sell you (Muncie 4 speed).
Driveshaft...hmmm, you may have to have a C3 yoke mated to a C4 driveshaft; it may even have to be shortened or lenghtened...Still not too hard; a specialty shop near me does it (they made a custon shaft for my last kitcar), there's surely one near you - look in The Yellow Pages under U-Joints and/or Driveshafts.
Use a 10 1/2" C3 friction plate (if the spline is different from C4; I don't know), and that should take care of that...
Adapt the C4 shift rods to fit the Muncie shift arms. Should be easy. I even have a complete C3 shifter I'll sell you (Muncie 4 speed).
Driveshaft...hmmm, you may have to have a C3 yoke mated to a C4 driveshaft; it may even have to be shortened or lenghtened...Still not too hard; a specialty shop near me does it (they made a custon shaft for my last kitcar), there's surely one near you - look in The Yellow Pages under U-Joints and/or Driveshafts.
Use a 10 1/2" C3 friction plate (if the spline is different from C4; I don't know), and that should take care of that...