Re: When is the bigger U joint needed?
[Re: radar]
#2554844
09/26/18 12:28 AM
09/26/18 12:28 AM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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I can't see reason to use less than a 7290 joint and if you are spending the money why not a 1350?
You can't hurt yourself with a bigger joint in joint.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: When is the bigger U joint needed?
[Re: AndyF]
#2554859
09/26/18 12:59 AM
09/26/18 12:59 AM
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Joined: Jan 2003
Posts: 11,709 Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,709
Portage,michigan
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I always use 1350 u joints. Never bothered to test different u-joints, I just automatically use the 1350 in every build. It seems to be the industry standard these days. Yep. Do it once, do it right
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, 10.40 @127 1/4 1.41 best 60 foot 6.60 at 103.90 1/8
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Re: When is the bigger U joint needed?
[Re: B3422W5]
#2554883
09/26/18 01:57 AM
09/26/18 01:57 AM
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Joined: Dec 2013
Posts: 4,669 Wichita
GY3
master
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master
Joined: Dec 2013
Posts: 4,669
Wichita
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I tried using 7260 and 7290 joints. It was a no-go in my combo. I even destroyed a FRONT yoke after a u-joint broke on the starting line at the dragstrip. 1350 Strange shaft and u-bolt rear yoke solved my issues. I even added 150 HP and zero issues.
'63 Dodge 330 11.19 @ 121 mph Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs. 10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.
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Re: When is the bigger U joint needed?
[Re: radar]
#2554916
09/26/18 08:55 AM
09/26/18 08:55 AM
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Joined: Oct 2015
Posts: 570 UK
rb446
mopar
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mopar
Joined: Oct 2015
Posts: 570
UK
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Put a big yoke on it, a friend here has just broke his front U at the track as its starting to hook...its only a mild 440 around 360hp/450TQ, 3700lb roadrunner on Dot drag tyres, 727- stockish verter....he's going Big.
1969 'Cuda 446ci, best 9.96@133.9 in 1990 1971 340 'Cuda, best 11.01@122.8 in 1987
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Re: When is the bigger U joint needed?
[Re: radar]
#2554940
09/26/18 10:37 AM
09/26/18 10:37 AM
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Joined: Jan 2003
Posts: 13,357 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,357
Marion, South Carolina [><]
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Go big. I started breaking the factory driveline stuff in my cuda running mid 11s at 3700 lbs. Go big once and be done w/ it.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: When is the bigger U joint needed?
[Re: radar]
#2554967
09/26/18 11:51 AM
09/26/18 11:51 AM
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Joined: Jan 2003
Posts: 11,709 Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,709
Portage,michigan
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D’oh I called him and he said he already put a small U end on my driveshaft instead of the conversion U. No big deal it’s just a shortened old truck driveshaft. I’m going to run a loop anyway so we’ll see how long it lasts. If or when I crack it I will throw the big yoke on my pinion.
Thanks Rdr The tranny will need looked at if you break the driveshaft. Keep that in mind
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, 10.40 @127 1/4 1.41 best 60 foot 6.60 at 103.90 1/8
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Re: When is the bigger U joint needed?
[Re: radar]
#2555070
09/26/18 03:43 PM
09/26/18 03:43 PM
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Joined: Dec 2005
Posts: 11,530 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,530
Fulton County, PA
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Good 1350s, if you can get a 1350 yoke for the rear. Why a 9.25? Given enough horsepower/weight/radials/sticky track, forged slip yokes will break too. A good billet piece will take care of that.
If the results don't match the theory, change the theory.
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Re: When is the bigger U joint needed?
[Re: radar]
#2555342
09/27/18 01:04 AM
09/27/18 01:04 AM
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Joined: Jul 2007
Posts: 1,682 Philadelphia
radar
OP
top fuel
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OP
top fuel
Joined: Jul 2007
Posts: 1,682
Philadelphia
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I wanted to do a 9.25 to be different and to be a cheapskate. I did yukon axles, crush sleeve eliminator kit, bearings, seals, and got everything back in spec for small money amd the axle was a parts trade. (Actually went through 2 to find a good one) I’m hoping street tires mixed with a light rear end in a 3000lb pickup truck will make traction always be the weakest link in my driveline. I was actually considering running an 8.25 because I have three of them but they look like a toy next to the 9.25. I did spend a few bucks on bling and bought a cast B&m finned cover which looks really nice under there.
Oh and a 70’s ramcharger 9.25 is already set up for 5 on 4.5” bolt battern and came in a width that fits perfectly in my tubs with my wheels. My ZJ rear disc brake system bolted right up too with just an enlargement of the central pilot hole which is another plus.
So no drag radials, no heavy weight, no track, and just a stock yoke... wish me luck, “hold my beer” haha
Last edited by radar; 09/27/18 01:07 AM.
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Re: When is the bigger U joint needed?
[Re: radar]
#2555353
09/27/18 01:36 AM
09/27/18 01:36 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I ran the small u-joint and yoke with the stock little straps and bolts on my racecar till I blew the ring gear on my stock 8 3/4.. once it blew the ring I changed over to a alum center 8 3/4 with a 1350 u-joint.. its still running fine but the car is for sale now
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