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auto to 4speed conversion confusion

G

glenns75vette

Guest
I want to change my auto over to a 4 speed and talked to many people and never get the same answer twice.What are the differences between muncie 20,21,22,saganaw, borg warner,t-10 and super t-10?. Looking on ebay I have seen many word combo's describing 1 trans.Do I need to change or just adapt the cross member?
 
B

Bullitt

Guest
Trans. ID

Muncie Id
Nasty Z28 Tranny Decoding

MANUAL:

BORG WARNER T10- 2.23 - 1.76 - 1.30 - 1.00
2.43 - 1.64 - 1.24 - 1.00
2.64 - 1.76 - 1.35 - 1.00
2.64 - 1.64 - 1.24 - 1.00
2.88 - 1.76 - 1.35 - 1.00
2.88 - 1.91 - 1.35 - 1.00
3.42 - 2.28 - 1.46 - 1.00
3.44 - 2.28 - 1.46 - 1.00

BORG WARNER T5 - 2.95 - 1.94 - 1.34 - 1.00 - 0.63 (TBI)
2.75 - 1.94 - 1.34 - 1.00 - 0.74 (TPI)

BORG WARNER T56- 2.66 - 1.78 - 1.30 - 1.00 - 0.74 - 0.50
2.97 - 1.94 - 1.35 - 1.00 - 0.84 0.62
3.36 - 2.07 - 1.35 - 1.00 - 0.84 - 0.62

MUNCIE M20 2.56 - 1.91 - 1.48 - 1.00
2.52 - 1.88 - 1.46 - 1.00

MUNCIE M21 2.20 - 1.64 - 1.28 - 1.00

MUNCIE M22 2.20 - 1.64 - 1.28 - 1.00

M-12 2.97 - 2.07 - 1.43 - 1.00 - 0.84 - 0.56

SAGINAW (4spd.)- 3.11 - 2.20 - 1.47 - 1.00
2.85 - 2.02 - 1.35 - 1.00
2.54 - 1.80 - 1.32 - 1.00
2.54 - 1.80 - 1.44 - 1.00
 

77-4speed

Well-known member
Joined
Apr 30, 2002
Messages
249
Location
Houston, TX
Corvette
1977 Black L-82 4-speed
Why a 4 speed?

If you're gonna convert it, why not go to a TKO or a ROD unit? Just about anyone with a manual 4 speed wishes it was a 5 or 6speed. Ask anyone and they'll tell you they wish their 4 speed with 370's had an overdrive.

My $0.02

Russ
 
D

Dave L.

Guest
I agree. you would be turning some pretty hi revs cruising about 70mph
 
B

Bullitt

Guest
Here's some more information I posted in the General Tech Forum. 5-Speeds.

--Bullitt
 
G

glenns75vette

Guest
tranny conversion

tons of great info, thanks!!!!!!!!!!
 

Buckskin7T7V

Well-known member
Joined
May 18, 2001
Messages
144
Location
Ca US
Corvette
1977 Buckskin
You do NOT have to change the cross member.
Having a 5 or 6 speed would be better. I converted over in 1980 so all there was was a Doug Nash 5-speed. Very expensive in 1980. If I ever blow the 4-speed up, I would go to a 5/6 speed.
 
A

aaron 76

Guest
used 5 Speed?????

What about getting a later model 5 Speed from say a 85 Camero or Fire Bird/
Theese should be pretty easy to come by at a wrecker.
Would these bolt in and if any of you have done this I would love to know what is required.
You see I have a fairly hot motor with a th350 and 4.11 gears and as you can see I realy need the over drive. I have thought of the th200 and the th700 but both options are extreemly expensive and I don't trust a used one however a used 5 Speed is a better bet when buying used thats why I am looking down this path and oh yes a 6 speed is out of the budget this year as well.
Thanks in advance.
Aaron
 

vetteKID

Well-known member
Joined
Jul 1, 2002
Messages
122
Location
ellicott city, MD
Corvette
74 L-48 coupe & 85 454 coupe
you dont want a t-5 (80's f-body M5 tranny). they cant handle power, i have heard about more T-5's breaking than any other trans. i have even seen them break under the power of a v6 f-body. if you have an L-48 car, or you dont put the petal to the floor much, then sure get a t-5, but if you want to race it, i wouldnt recomend it.
 
A

aaron 76

Guest
What would you recomend for a 5 speed then. Keep in mind I will be trying to find it in an auto wrecker
Thanks
 

Buckskin7T7V

Well-known member
Joined
May 18, 2001
Messages
144
Location
Ca US
Corvette
1977 Buckskin
The 5-speed was to light to take any kind of power. I would stick with the 4-speed. If you need to fix it, parts are around. It has been proven to stay together. Put the money in a good clutch and pressure plate.
 
H

HOTMOTORSPORTS

Guest
Bullitt

I can't believe the information you've just given all of us.

It's fantastic. I've saved it all for this winter's project.

Thank you.

Chuck
 

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