Topic: Drive Shaft question
in Forum: C3 Driveline Components
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MARYSVILLE, WA - USA
Joined: 10/22/2006
Posts: 129
Vette(s): 1976 stingray, L48 COUPE, TH350 Automatic WITH A ZZ4 355 HP 350 C.I. MOTOR, 750 cfm HOLLY, EXTERIOR RED, INTERIOR BUCKSKIN, SMOKE BLACK GLASS TEE TOPS.
It there any difference in the driveshaft for a TH350 VS A TH400 tranny? I just bought a new one from ZIP products on line and then saw in the catalog that it was good for a TH400. I think I have a TH350 in my early 1976 L48 but I'm not sure.
carl
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If your tranny is original, it is probably a TH350. Mine is an early 76 - L48 and has the TH350. The L-82s apparently still came with the 400. You can tell easily by looking at the pan (probably don't even need to raise the car). The pan is a square shape. The TH400 shape is pointy at one end and square on the other (very obvious difference). I think it also has a couple of factory indentations in it.As far as whether the drive shaft will interchange with the TH400 drive shaft, I don't know for certain (someone here does know I'm sure). If there is a difference, I think it would only be in the splines in the yoke (no length change).
My L-48
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Yelm, WA - USA
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Vette(s): 1979 L82 4 speed Scat 383 crank 190 cc Procomp Aluminum Heads 202 160 stainless valves GM Powder metal rods Speedpro H860CP Hypereutectic pistons 280 cam hydralic HEI Pro comp 1.6 roller rockers Mighty Demon 750 Sanderson CC1AP Hedders.
I looked at Zips and they have it listed
68-79 AUTO & 71-79 4-SPEED DRIVE SHAFT W/U-JOINTS
Product Number: SU-421. My drivelines out of the car it's 30 7/8" long and 3 7/8" at the flange. The u-joints are 3 5/8" wide. Hope this helps!
Product Number: SU-421. My drivelines out of the car it's 30 7/8" long and 3 7/8" at the flange. The u-joints are 3 5/8" wide. Hope this helps!
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Hmmm...the 400 and the 350 are different lengths. The yokes stay in the trans(u-joints bolt to the yoke), so that wouldn't be a problem anyway. I may have to look in the Gm parts book to see if there were different shafts now...
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Former Member
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MARYSVILLE, WA - USA
Joined: 10/22/2006
Posts: 129
Vette(s): 1976 stingray, L48 COUPE, TH350 Automatic WITH A ZZ4 355 HP 350 C.I. MOTOR, 750 cfm HOLLY, EXTERIOR RED, INTERIOR BUCKSKIN, SMOKE BLACK GLASS TEE TOPS.
Well, I confirmed I have a TH350 (by looking at the filter cover).
I also confirmed that the TH350 is different than the TH400 in length so all I really need to know now is did ZIP products send me a drive shaft that will work on my TH350 OR one for a TH400 .
I sent an e-mail to their tech and asked that question. But for those interested in the drive shaft I got:
The P/N on the drive shaft tag is SU-421 WITH additional number below *D21601Z*. The shaft dimension taken from centers on u-joint casting (at pivot point) is 29 1/2"
carl
Former Member
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MARYSVILLE, WA - USA
Joined: 10/22/2006
Posts: 129
Vette(s): 1976 stingray, L48 COUPE, TH350 Automatic WITH A ZZ4 355 HP 350 C.I. MOTOR, 750 cfm HOLLY, EXTERIOR RED, INTERIOR BUCKSKIN, SMOKE BLACK GLASS TEE TOPS.
Well, I just got off the phone with the tech at ZIP products and he assures me that the shaft I got will fit the TH350 tranny. So with a trusting heart I'm off to the drive shaft shop with my tranny yoke to get the assembly balanced. Wish me luck! Thanks for all the input guys!
carl
Former Member
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MARYSVILLE, WA - USA
Joined: 10/22/2006
Posts: 129
Vette(s): 1976 stingray, L48 COUPE, TH350 Automatic WITH A ZZ4 355 HP 350 C.I. MOTOR, 750 cfm HOLLY, EXTERIOR RED, INTERIOR BUCKSKIN, SMOKE BLACK GLASS TEE TOPS.
I won't installing the drive shaft until around February as I'm still trying to save up the money for my transmission rebuild first. I'm changing the motor to a new ZZ4 and wanted to redo the drive line at the same time. Tha't why the new driveshaft, u-joints etc...
I will post a report on the total upgrade once I finish, hopefully March or April.
carl
in Forum: C3 Driveline Components
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