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#1 | |
Bloo
Join Date: Feb 2001
Location: Barren County Kentucky
Posts: 6,285
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3 speed manual to 4 speed manual?
what all do i need to do this? the parts i have are:
all clutch linkages and new clutch/pressure plate high hump column converted to 4 speed (did that when i put the 3 speed in the floor) 4 speed shifter will my 3 speed driveshaft and cross member work? the cross members look identical to me, but i think the driveshaft is going to be too short
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ASE Master Certified-GM Trained-Mechanic 1968 Chevy C30 157" WB Wrecker 1969 Chevy CST/10 SWB 1971 Chevy Custom/10 (first truck) 350, NV3500 5 speed 1971 Chevy K20 Custom Camper 4x4 350 TBI, SM465/NP205 1974 Chevy Custom Deluxe/10 1979 Chevy Custom Deluxe K10 farm truck beater 1989 Chevy K2500 Quote:
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#2 |
Resident Curmudgeon
![]() Join Date: Dec 1999
Location: NH
Posts: 6,664
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The xmember should be find because it bolts to the bell housing. The 3 speed has a slip yolk whereas a truck 4 speed does not. You will have to change driveshafts. Beware, a 3/4 ton DS won't fit a 1/2 ton due to rear end differences. There are also different carrier bearings to consider as well. It's easier to go from 3 speed to auto than to 4 speed because of this.
If this is a car 4 speed, then it's a different story altogether.
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Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter ![]() Maybe I need to sell some of this crap ![]() Yet another Bozo with a sawz-all |
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#3 | |
Bloo
Join Date: Feb 2001
Location: Barren County Kentucky
Posts: 6,285
|
it's an SM465, i was looking and it looks like the yolk can be changed, but the 3 speed seemed longer, so i didnt think it owuld work... how hard is it to find a SM465/v8 half ton driveshaft front half?
__________________
ASE Master Certified-GM Trained-Mechanic 1968 Chevy C30 157" WB Wrecker 1969 Chevy CST/10 SWB 1971 Chevy Custom/10 (first truck) 350, NV3500 5 speed 1971 Chevy K20 Custom Camper 4x4 350 TBI, SM465/NP205 1974 Chevy Custom Deluxe/10 1979 Chevy Custom Deluxe K10 farm truck beater 1989 Chevy K2500 Quote:
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#4 |
Resident Curmudgeon
![]() Join Date: Dec 1999
Location: NH
Posts: 6,664
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There are a lot of factors here, carrier bearing mount and location being a big consideration. If it were me, I'd see about having your existing front driveshaft modified rather than trying to locate the correct setup. Fast68 went thru this a year or so ago and never had any success locating the correct setup for what it's worth
__________________
Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter ![]() Maybe I need to sell some of this crap ![]() Yet another Bozo with a sawz-all |
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#5 |
Bloo
Join Date: Feb 2001
Location: Barren County Kentucky
Posts: 6,285
|
when i measured the 3 speed seemed 5 inches longer, any idea what it would cost to have a driveshaft lengthened that much? i'll call tomarow to get an excact quote.. it looks to me like i can take the yolk off the drivehsft, and then bolt the 4 speed to it with the little "u" clip things it connects with
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