can i put a cv joint on the rearshaft - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**hilljob26** · 04-24-2005, 10:02 AM

i have a 72 chevy 4x4 but i am using a tcase out of an 80 blazer that has a slip yoke,can i put a constant velosity (like the front has) behind the yoke,will that work ok,my truck is lifted 6 inches and i just though that that would make a better angle for my driveline

Mudder · 04-24-2005, 10:34 AM

Usually the rear is done by placing a wedge under the leaf pack.

Mike C · 04-24-2005, 10:14 PM

I'm not sure how the dynamics of the slip yoke plays out, but I have a rear CV on my Jimmy but using a two piece shaft. I had to change the output yoke and other than that, bolted right on. With 4" springs in the rear, the length of the Jimmy shaft was just too short. Tom Woods build mine when he was with 6 States. Has his own shop now. You can rotate the housing up like Mudder says, but you wind up with a driveline that is out of phase. Angles on top and bottom should be same with a conventional driveshaft. Using the CV, you want zero degree angle on the axle (driveshaft inline with pinion) and all of the rest at trans. This works well with aftermarket springs that use a wedge to rotate axle housing to minimize binding. Honestly, with a truck the length of the shaft is sufficient you should be able to lower the back of the T-case and use wedges at the axle to correct driveshaft angle. Especially if it is a longbed truck.

Mudder · 04-25-2005, 02:18 AM

Didn't think to say. My TC has been dropped for many years and I have a 4". I get the angle under the springs with the blocks. The blocks and the TC was done back in the early 80's when it was a 77 truck and done a lot of mudding. Someday...... I may get a different frame and at that time I may go to all springs lift.

**JIMs70GMC** · 04-25-2005, 06:24 AM

My neighbor's ford has a cv joint at the rear of transfer case but the slip joint is in the driveshaft not tailshaft of the tc. The funny thing is his front does not have a CV joint, it's a 79 w/ a high pinion dana44 up front.

jcueckert13 · 04-25-2005, 09:00 AM

actually its a double cardan joint not a cv joint

**JIMs70GMC** · 04-25-2005, 09:47 AM

Got me.

Esteban86K5 · 04-25-2005, 10:10 AM

That is what I had on my truck. I did the shimming and lowering of the t-case and could never get rid of the driveline vibes. So I went with a 1 ton CV and never had a problem again. I raised the t-case back to normal hieght and cut and welded the spring perches to obtain the correct pinion angle instead of useing shims. I run the slip yoke and it worked fine.

**hilljob26** · 04-28-2005, 10:18 PM

well i have a 6 inch lift w/ blocks in rear,and they are tapered,am i ok running a regular driveline,it only has about 1" of shaft sticking out of the t case,hope it works

04-24-2005, 10:02 AM	#1
hilljob26 Registered User Join Date: Dec 2004 Location: Gypsum Kansas 67448 Posts: 1,681	can i put a cv joint on the rearshaft i have a 72 chevy 4x4 but i am using a tcase out of an 80 blazer that has a slip yoke,can i put a constant velosity (like the front has) behind the yoke,will that work ok,my truck is lifted 6 inches and i just though that that would make a better angle for my driveline __________________ 21 2500hd duramax 58 apache HILLJOB GRAPHIX--for all your graphic needs My build thread http://67-72chevytrucks.com/vboard/s...d.php?t=542497 LS ENGINE SWAP INFORMATION THREAD http://67-72chevytrucks.com/vboard/s...d.php?t=377348 4l60 to an NP205 http://67-72chevytrucks.com/vboard/s...43#post3697343

04-24-2005, 10:14 PM	#3
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,738	I'm not sure how the dynamics of the slip yoke plays out, but I have a rear CV on my Jimmy but using a two piece shaft. I had to change the output yoke and other than that, bolted right on. With 4" springs in the rear, the length of the Jimmy shaft was just too short. Tom Woods build mine when he was with 6 States. Has his own shop now. You can rotate the housing up like Mudder says, but you wind up with a driveline that is out of phase. Angles on top and bottom should be same with a conventional driveshaft. Using the CV, you want zero degree angle on the axle (driveshaft inline with pinion) and all of the rest at trans. This works well with aftermarket springs that use a wedge to rotate axle housing to minimize binding. Honestly, with a truck the length of the shaft is sufficient you should be able to lower the back of the T-case and use wedges at the axle to correct driveshaft angle. Especially if it is a longbed truck. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

04-25-2005, 06:24 AM	#5
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	My neighbor's ford has a cv joint at the rear of transfer case but the slip joint is in the driveshaft not tailshaft of the tc. The funny thing is his front does not have a CV joint, it's a 79 w/ a high pinion dana44 up front. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

04-25-2005, 09:00 AM	#6
jcueckert13 Registered User Join Date: Apr 2003 Location: Edgewood New Mexico Posts: 2,088	actually its a double cardan joint not a cv joint __________________ 1990 subaru legcy (daily driver) 1987 Toyota 4runner (weekend toy) 1968 C30 flatbed dually 1970 C10 longbed stepside (in pieces) 1976 Dodge Dart 1963 Dodge Dart

04-25-2005, 09:47 AM	#7
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Got me. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

04-24-2005, 10:34 AM	#2
Mudder Registered User Join Date: Feb 2001 Location: East Central, MO Posts: 11,336	Usually the rear is done by placing a wedge under the leaf pack.

04-25-2005, 02:18 AM	#4
Mudder Registered User Join Date: Feb 2001 Location: East Central, MO Posts: 11,336	Didn't think to say. My TC has been dropped for many years and I have a 4". I get the angle under the springs with the blocks. The blocks and the TC was done back in the early 80's when it was a 77 truck and done a lot of mudding. Someday...... I may get a different frame and at that time I may go to all springs lift.

04-25-2005, 10:10 AM	#8
Esteban86K5 Registered User Join Date: Oct 2003 Location: Bakersfield Posts: 133	That is what I had on my truck. I did the shimming and lowering of the t-case and could never get rid of the driveline vibes. So I went with a 1 ton CV and never had a problem again. I raised the t-case back to normal hieght and cut and welded the spring perches to obtain the correct pinion angle instead of useing shims. I run the slip yoke and it worked fine. __________________ Be American Buy American My Pics

04-28-2005, 10:18 PM	#9
hilljob26 Registered User Join Date: Dec 2004 Location: Gypsum Kansas 67448 Posts: 1,681	well i have a 6 inch lift w/ blocks in rear,and they are tapered,am i ok running a regular driveline,it only has about 1" of shaft sticking out of the t case,hope it works __________________ 21 2500hd duramax 58 apache HILLJOB GRAPHIX--for all your graphic needs My build thread http://67-72chevytrucks.com/vboard/s...d.php?t=542497 LS ENGINE SWAP INFORMATION THREAD http://67-72chevytrucks.com/vboard/s...d.php?t=377348 4l60 to an NP205 http://67-72chevytrucks.com/vboard/s...43#post3697343

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