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Does anyone know how much torque a stock 4 speed GM tran's can take. I am putting a big block in my truck and I have herd they can bust the main shaft. This will be a built engine not stock and I do tend to be hard on it. Is there any manual tran's that can hold up to high abuse and torge that is still able to be used on the street.
Thanx:D
i was going to put a four speed behind my built small block, but decided against it because i already had a th350. I'm not sure of the exact numbers but it really depends on what four speed you chose, from what i gather there are three main coices, saginaw, muncie and borg warner. I'm pretty sure saginaws arent that strong. Muncies and Borg warners should be able to handle the abuse.
Well chevy trusted the M22 rock crusher to do the job behind the big boys, ie LS7, L88, ZL1, 500 + hp/tor depending on tune.
Leave the M21 & M20 to the mice motors and the saginaw to the 6 bangers. :toocool:
in a truck i can not see useing any gm 4 speed they are all junk the truck is heavy and i do not think it will hold up. a ford top loader or mopar is what i would look for. the 22 was a ok trans but try to fine a good use one is tuff .a lot of the gms 4 speed trans have been beat to death so theres a lot of junk out there:whacked:
muncies are ok just build em up
right
What about the richmond gear, T10 4spds that they sell in summit and a few other places
hi hp and torque in a heavy truck a aluminum case trans is not what i would call idea.m22 or m21 is not up to it. if this make more hp and torque and in a heavy truck it will brake the case is to lite and the in put is to small and the cluster pin is to small ok for a lite car but .a truck this is not the trans :whacked:
If it's a mud bogger or 4wd truck, why not a Muncie SM420 4spd with low 1st, shouldn't be too hard to find 1. They put them in '60-'67 Chevy and GMC 4X4 trucks, deffinetly 3/4 ton, maby 1/2 tons. The trucks that had them had 4.56 gears. They have a PTO that comes out of the passanger side. They used variences of this trans up into the early '80's, in which some of the trucks had stock 454's.
I agree with Pat. For heavy duty use a Ford top loader or Mopar 4 Speed. If this is any indication of what the serious racers use, Lakewood makes Chevy bellhousings with a Ford or Mopar bolt pattern so you can use one of those transmissions behind a Chevy. I have run a Muncie behind 2 425+ hp 427s. One in a 4000 pound Biscayne and the other in a 3500 pound Chevelle. They both survived in a street/strip car, but I was not running them flat out in serious competition. I was using what was in the cars, if you are going to go shopping for a transmission, might was well get one that will last a long time. If it meets your needs, you might also consider a Nash 5 speed.
my $.02
Pat
Here's another option with straight-cut or helical gears depending on how much noise you can tolerate......
http://www.g-forcetransmissions.com/tran_gt-5.asp
I looked at the richmonds but thought they would be to week. That G-force looks great but I am thinking my motor will produce more than 500 ftlb's. I have heared of a Jerico I think. Anybody use those.
toploader....
http://www.4speedtoploaders.com/
jerico....
http://www.jericoperformance.com/
tremec TKO....
http://www.brothersperformance.com/s...re2600708.html
upgraded M22....
http://www.carcraft.com/howto/56399/
http://www.autogear.net/
How about the Super T-10?
Maybe this is the answer, 650 ft. lbs. of torque capacity.....
http://www.ddperformance.com/GM%20T56.htm
www.m-22.com about 750 ft lbs of torque scroll down the page he has a few differnt trannys including one with OD........scooter
So there you have it, a 4-speed that will tolerate over 700 ft/lbs for $2,499 or a 6-speed that will tolerate 650 ft/lbs for $2,699. Thanks for the help Scooter. :)
:3dSMILE:
Warner T-10 would be my choice. The "Farmer Four" truck tranny is tough, but the gear ratios are too wierd for your use. A Muncie M-22 would work too.
yes there is trans out ther that can take it but $2699 to $2466 how can you tell me that s a m22 it is much better ?not one stock m22 or m21 ?? i would not wast my time with a stock gm m21 or m22 by the way do you know what he is putting a 4 speed in? mud truck .street truck .off road how big are the tire?? i like to see a big block that make 650 torque in a truck that is 4500+ pounds spining a set of 33 talls and see what happens if it hooks . like rigth now or side steps the clutche at 6500 rpms?yes for a price there is good stuff out there but them trans are not stock gm .i though that was the post subject /:whacked:
I realy appreciate all the help and you guys gave me alot of choices. And pat I have a stock tranny know but I dont need a stock one I would like to know what it will handle. I guess we will find out because I will gernade that one before I spend the 2,500 dollars. The truck has chincy 33in street tires now but will be getting 38 or maybe 40 if I have enogh money left over. I had a set of 44 but sold them. Needed money.
that m-22 overdrive only shows 4 gears. Is it a 3 speed with over drive?
I thought the 4th gear is less than 1:1 - something like .87:1.
So - its a 4th gear overdrive - at least thats what I saw it as.
Bert
hehehe i shopuld get me one of them super rock crushers so i can shift at 8 grand teehehehehehehe:LOL:
So it is a tree speed with the fourth gear being overdrive. Right
"........So it is a tree speed with the fourth gear being overdrive. Right.........."
Kind of but not quite:confused:
Normally what happens with the 4 speeds overdrive units that are based on a standard 4 speed is that the 3rd gear set (the cluster gear and 3rd gear) is replaced with an overdrive gear set. That is because there is no true 4 "gear" in these transmissions. Fourth simply locks the input and output shaft together to creating the 1 to 1 ratio.
Ford and Chrysler both took this approach in the late 70's; Ford with the RUG style top loader and Chrysler with the 833. Off the top of my head I don't remember GM doing this. I suspect that that is the same approach used by the guy building the Muncies.
In the case of both the Ford and Mopar units these trannys used an existing case, and the special cluster and OD gear (what would be 3rd gear in a standard 4 speed).
The shift lever on the side of the transmission is flipped over and a standard shifter is used (with the lever flipped over the transmission now shifts into direct (now your 3rd gear) then OD) in the normal shift pattern. This was a very cost effective way to develop an OD tranny as it's basically only a gear set change
If your looking at one of these trannys for your project keep in mind that the main reason that they were developed was for fuel economy not necessarily performance. They do have a pretty low first gear in them (usually in the 3.0 something area) and a decent 2nd gear. Unfortunately, there is usually a VERY big jump into 3rd (1:1). This is not TOO bad in something with pretty steep gears to begin with or a broad torque curve. Basically their a good tranny for a cruiser, but not the hot ticket for a race car.
Joe, is your truck a 4wd?
yes with a 1977 chevy 4 speed and a gear to gear transfercase.