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Old 03-22-2008, 08:05 PM
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LS1/4L60E/C4 Differential Alignment?

I got the C4 rear in four boxes yesterday. I just got finished putting it back together and mocking it up under the frame. I have a question. I know that typically you are suppose to have a slight angle to a driveshaft going into a rear end. Does that really matter on these as the differential is in a fixed position? I'm wondering if it can be near straight or angled up toward the rearend from the transmission? My trouble is....My transmission snout is going to be much lower than the pinion on the rear end. I'd rather not have to lose floor space by raising the transmission. Will it matter if I have to angle the driveshaft up to the rearend instead of vise-versa? Also....I saw where someone made a comment on the forum, that the propeller shafts need to be angled slightly down. What about angled slightly up as long as I have plenty of travel for the coil-overs? Any idea just how much travel I should allow for? I'm using Aldan's for the front and most likely will use the same for the rear.


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Old 03-23-2008, 09:06 AM

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Dave, I just attended a seminar conducted by Brent VanDervort, known as Fatman of Fatman Fabrications, that addressed the subject of installing front and rear ends. I will send you a copy of the handouts he had and they may be of some help. One point he stressed was not to use a direct alignment of tranny out put shaft and pinion shaft. An ideal 3* angle is needed to force the needle bearings in the u joints to rotate. Failure to rotate causes excessive wear and pounding of the bearings and very early failure. Side to side offsets are "no problem since the drive shaft is rotational-doesn't know horizontal from vertical misalignment". He did address a pinion higher than the tranny out put shaft and indicated that the ideal 3* rule should be slightly reduced since the upward axle travel from bumps and additional loads tends to increase the angle vice the angular decrease that is experienced in the more normal pinion lower than the tranny. I would be more concerned with the extremely low tranny if it is lower than the pinion shaft!! Speed bumps are going to be a real threat!!

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