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I have a built LM7, makes around 425/425 that I am putting in a 92 BMW 325 that I use for autocross/time attack/etc. Let me start by saying the car was $400 and after getting the suspension all done up I maybe have 3k in it so this next step will also be very budget sensitive. I am struggling to figure out what manual tranny to use for this. the T56 is too expensive and I dont need the the OD either, the T5 I think will be to weak. I am looking for opinions on what tranny to go with and components to to make it all work. so fire away!
T10 or Muncie. About 50lbs lighter than a T56 too. I've bought them for as little as $100. Go with a 26 spline version, they're stronger than the 10 spline.
Part numbers you'll need: https://ls1tech.com/forums/conversio...-ls-motor.html
I hear ya, I know the t56 is the strongest but its just not cost effective for me and I dont need the extra gears. It will mostly be used in 1,2,and 3rd.
T10 or Muncie. About 50lbs lighter than a T56 too. I've bought them for as little as $100. Go with a 26 spline version, they're stronger than the 10 spline.
Part numbers you'll need: https://ls1tech.com/forums/conversio...-ls-motor.html
the write up is sweet, thanks. I like to be in 1st and 2nd for autocross and noticed that there are a few different options for the gearing of the t10's. what vehicles did they come in? My car has 3.15 rear end and my tires are 275/35/15 hoosier's, with the power my motor is making which one should I be looking for? dont laugh but when you say BBC your talking about big block chevy right?
Yes, BBC is a big block chevy 396, 427, 454.
Muncies came in everything. I think all past around 69 were 26 spline with the large countershaft. Although the gear ratios were limited to close and wide ratio models (2.2 vs 2.6 1st gear).
T10s were available in the early 60s, then showed up again in the mid 70s in vettes and f bodies. They were available in a wider variety of ratios, from 2.4 to 3.4 1st gear. The most common will be the 2.6 1st in mid 70s f body and vettes. Around 80-82 vettes got a 2.88 1st gear T10. There was also a production 3.42 1st gear T10 in Camaros around 82/83, I'm running one with a 2.73 rear.
You'll need to figure your rpm range, tire size, and rear end ratio to see what will work for you. The higher 1st gear ratios will be the weakest, but with a 5.3 and not drag racing, most will be fine for you.
Yes, BBC is a big block chevy 396, 427, 454.
Muncies came in everything. I think all past around 69 were 26 spline with the large countershaft. Although the gear ratios were limited to close and wide ratio models (2.2 vs 2.6 1st gear).
T10s were available in the early 60s, then showed up again in the mid 70s in vettes and f bodies. They were available in a wider variety of ratios, from 2.4 to 3.4 1st gear. The most common will be the 2.6 1st in mid 70s f body and vettes. Around 80-82 vettes got a 2.88 1st gear T10. There was also a production 3.42 1st gear T10 in Camaros around 82/83, I'm running one with a 2.73 rear.
You'll need to figure your rpm range, tire size, and rear end ratio to see what will work for you. The higher 1st gear ratios will be the weakest, but with a 5.3 and not drag racing, most will be fine for you.
Do you think it's a must to look for a 26 spline verse the 10 spline for strength or ease of configuring the rest of the clutch parts? Cause it looks a lot cheaper to find the 10 splines. Also are Saginaw 4speeds pretty weak, I see a lot of those for cheap as well.
Forget the Saginaw, they are pretty weak.
The pre 66 Muncies have a 7/8" countershaft and will wallow out the front case hole. Avoid these unless you plan on spending money having one bushed or swapping out for a supercase. I've got one sitting in the garage with that issue now.
The 10 spline is fine for power handling, but using the HEAVY flywheel required with it might not be the best for rallying.
Also, very limited ratios, ID info: http://www.dandltransmission.com/muncieratio.html
I'm not too familiar with very early T10s. The later super T10s have a good selection of ratios and will also be strong enough with the possible exception of the 3.42 version. All super T10s will be 26 spline.
ID info: http://pontiacpower.org/BW.htm
Check craigslist, I've bought Muncies and T10s for $100 - 250 locally. Just plan on another $100 for synchros/rebuild kit.
12-14-2014, 01:56 PM
need help making decisions! 
