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06-23-2009, 09:33 AM
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#1 |
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Registered User
Join Date: Jun 2009
Location: Des moines, Iowa
Posts: 17
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4 speed question
What 4 speed was used in 1977 1/2 2wd Chevy trucks? Would it be a good performance transmission??
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06-23-2009, 09:39 AM
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#2 |
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On a budget like Fred Sanford
Join Date: Oct 2005
Location: Topeka, KS
Posts: 2,031
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Re: 4 speed question
Most likely it's a sm465. Not at all a performance oriented trans with it's granny low gear, definitely a big truck tranny.
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'85 Silverado swb: 383 stroker, 10.5:1, vortec heads, 232/238 roller cam, RPM air gap, performer 750 carb, stainless longtubes, 3" duals/super 44's, T56/4.11 383ci build / exterior refresh thread '98 Camaro z28: 370ci twin turbo 370ci build '01 Tahoe LT 4x4: 5.3, longtubes/ory, magnaflow duals, custom tune....wife's DD |
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06-23-2009, 10:37 AM
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#3 |
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Registered User
Join Date: Jun 2009
Location: Des moines, Iowa
Posts: 17
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Re: 4 speed question
Anyone know where I can get the parts to convert my auto to muncie 4 speed.
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06-23-2009, 10:58 AM
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#4 |
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It'd be alot cooler if you did
Join Date: May 2003
Location: Three Rivers, MI
Posts: 2,345
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Re: 4 speed question
The linkage for the clutch is all the same, and Hurst makes a shifter for the "muncie in a truck". Other than that you'll need a slightly longer drive shaft yoke or you'll need to lengthen the drive shaft about an inch. Use the donor vehicle info when ordering the flywheel, clutch, etc.
*edit* Hit the junkyard for the pedals and z-bar. I forgot you said you were starting with an auto. Also when I did mine I got the clutch rod boot, springs, new pedal covers, new pedal bushings and all the other small stuff from the dealer. Last edited by smashingchuck; 06-23-2009 at 11:00 AM. |
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06-23-2009, 12:16 PM
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#5 |
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On a budget like Fred Sanford
Join Date: Oct 2005
Location: Topeka, KS
Posts: 2,031
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Re: 4 speed question
You cannot lengthen a drive shaft, only shorten it. If the one you have is too short after the conversion, you need a new longer one. Depending on what auto you have now, the stock one should work. I think mine is a stock one piece DS from a th350 2wd truck. I've got a M21 muncie in mine. The stock crossmember can be reused, just drill new holes in the frame. Like said above, find a donor truck in the salvage yard and take EVERYTHING. Pretty easy swap once you have all the parts.
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'85 Silverado swb: 383 stroker, 10.5:1, vortec heads, 232/238 roller cam, RPM air gap, performer 750 carb, stainless longtubes, 3" duals/super 44's, T56/4.11 383ci build / exterior refresh thread '98 Camaro z28: 370ci twin turbo 370ci build '01 Tahoe LT 4x4: 5.3, longtubes/ory, magnaflow duals, custom tune....wife's DD |
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06-23-2009, 12:33 PM
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#6 |
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Registered User
Join Date: Jun 2009
Location: Des moines, Iowa
Posts: 17
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Re: 4 speed question
I have the TH350 in mine at the moment.
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06-23-2009, 12:41 PM
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#7 |
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Registered User
Join Date: Mar 2008
Location: Salt Lake City UT
Posts: 441
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Re: 4 speed question
Depending on what you mean by "performance".......If you're going to power shift, I'd suggest getting a Muncie 4-speed. You can get the mechanical clutch linkage from the wrecking yard or go to LMC and get most of the parts new.
A T-56 is also a reasonable "performance" transmission. From the two I've seen in pickups, you'll have to change the trans mount, possibly modify the crossmember, change shifter location, modify the driveshaft and install a hydraulic clutch setup. |
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06-23-2009, 11:09 PM
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#8 | |
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It'd be alot cooler if you did
Join Date: May 2003
Location: Three Rivers, MI
Posts: 2,345
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Re: 4 speed question
Quote:
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06-24-2009, 12:34 AM
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#9 | |
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Workaholic
Join Date: Oct 2002
Location: Katy, TX
Posts: 1,589
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Re: 4 speed question
Quote:
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1979 K-10 Silverado (work in progress) 1991 V1500 Subruban 1999 Suburban LT 4x4 2006 Suburban LTZ (daily driver) |
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06-24-2009, 09:37 AM
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#10 |
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On a budget like Fred Sanford
Join Date: Oct 2005
Location: Topeka, KS
Posts: 2,031
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Re: 4 speed question
I should rephrase.......The only way to add length to a drive shaft is to "re-tube" it, meaning you remove both weld yokes and install them on a new tube of the proper length. As cheap as new drive shafts are it's easier/cheaper to just measure and buy a new one.
__________________
'85 Silverado swb: 383 stroker, 10.5:1, vortec heads, 232/238 roller cam, RPM air gap, performer 750 carb, stainless longtubes, 3" duals/super 44's, T56/4.11 383ci build / exterior refresh thread '98 Camaro z28: 370ci twin turbo 370ci build '01 Tahoe LT 4x4: 5.3, longtubes/ory, magnaflow duals, custom tune....wife's DD |
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