I've been asking this everywhere, maybe you can help me out. My truck is lowered 2/3 on top of the zq8 and mine has a vibration around 55 mph, and it shakes when taking off from a standstill. I've spaced my carrier bearing 1" and took my truck to the local driveline shop. They are telling me that I have 0* at the trans, and 3* at the diff. Everything looks good to them and they recommend that I balance my driveshaft next. Well I heard thats not necessary, but was told from a member on the forum, Joe (who made my carrier spacer), to add shims to the rear, like 2 or 3*. You're saying that you need 6* total in the rear. If I were to get a set from you, would that solve my vibration? Cuz I may just get a set of 3 inch steel blocks with 6* taper. What kind of prices is your friend charging? Can you tell me how to use an angle finder? Cuz I'll go buy one and check the angles myself if I get new blocks. If you want, PM me with all info you have, cuz the chevy delaer and the driveline shop won't help with bigger shims for the rear. I think you know exactly what it's going to take to get rid of this vibration.mrtire said:Well you may not know this but every manufacturer works the same way ford chevy you name it . On the assembly line there are defective parts laying around and when they run out of the certified parts the blems or defects go in ., Maybe nothing more then a blemish or someting stupid. As for this thread almost evey gm mini truck and blazer runs the same rear end 7.625 10 bolt housing and carrier with different ratio for different models. The one thing that separates a zr2 from a regular s10 is the angle at which the spring perches are mounted . Now just imagine running out of the zq8 rear , and again mostly the only difference is the gear ratio and rear brake setup besides the sping perches and the degree that they are welded on ( pinion angle ) depends on which model they go on. They will grab one from the other pile and slam it in. That is why some people have pinion angle problems . And dont forget the driveshafts too same thing. I have had both problems , my driveshaft was 2 1/4 inches too long and my pinion angle was way off . If you want to check call any gm dealer and ask for part #s for a zq8 driveshaft and a standard s10 they are different . And if they tell you they arent they are lying I checked the part #s myself. Sorry for the long thread I hope something here makes sense.
I thought the xtra cabs wouldn't have to shorten the driveshafts because of the slip joint at the carrier bearing? Also do you have that guys website, I'll check it out and see what it's like.mrtire said:There really is no science to this . First This guy is not my friend . I found him surfing the web and his website is very professionaland informative you should probably go there and rear some of his stuff.
Second the driveshaft angles ( pinion angles ) can be up to 3 degree difference from each other as long as the angles are in a downward angle. Typically you would want 3 degrees posative angle on the trans and three degrees negative on the rear diff so when the rpm increases they will cancel each other out . see diagram below .
As for the measurements that you will have to figure out on jack stands .Lift the whole truck off of the ground , the jack stands will have to be under the rear housing to simulate ride height. Measure each end with an angle finder to get your centerline, and use basic math (subtraction ) to find tha angle you need . I am still in the process of doing mine , my rear is higher than my transmission centerline so I have to use shims on my trans also to corret my problems along with shortening my driveshaft and setting my rear angle. Hope this helps .
Thanks for the website. You're right, tons of good info. I even know where they are located. I used to live in So Cal. I was wondering why the website sounded familiar.bg's said: