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#1
09-06-2023, 11:25 AM
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3R yoke and strap limitations?
Back in 2010 I pretzeled the stock driveshaft on my 78 T/A. After that I had a custom and much stronger driveshaft made at Drive Line Services in Colorado Springs. It has Spicer 3R U-joints on both ends with the transmission yoke being provided by DLS when they built the driveshaft. I got the rear 3R 12-bolt yoke from a classic auto recycler. It has the strap style retainers.
Now that the car is well in the 11's and has broken into the high 6 second zone with a 125HP shot of nitrous, should I be worried about the current setup? I'm the right car (not a great light but it was on a .400 pro tree)
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 Johnny US Army Retired1978 T/A 463 Pontiac, KRE 74cc 292CFM D-ports, Lunati VooDoo, V-max lifters, TKII, ATM 850 E85 carb, TCI TH-350 race tranny, 3600 converter 3.73 12 bolt 11.63@116.68mph 1981 T/A 4-speed 406 Pontiac, Merrick ported 6X heads, Comp 270S cam, Crosswind intake 750 Street Demon, 3.42 30 spline Eaton posi street car. 1980 Formula 350 Pontiac back burner project 1972 LeMans 350 Pontiac |
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#2
09-06-2023, 06:07 PM
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3R and 1330 U-joints have the same cross width and cap dimensions, except the 3R is internal snap ring and the 1330 is external. The 3R or 1330 should be able to handle 500-600 HP unless you're launching a manual or a T-brake. If you're hitting them real hard off the launch, I'd upgrade to 1350, at least at the front.
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I could explain all this to the girl at the parts store, but she'd probably call the asylum. White '67 LeMans 407/TH350/Ford 3.89... RIP Red '67 LeMans. 407/TH400/Ford 3.25 |
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#3
09-07-2023, 04:13 PM
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My factory driveshaft and Lakewood solid 3Rs but rebalanced is what is in the 78 and had a lot of 1.5 60 fts with slicks weighing 3750.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
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