Okyou will need a posi unit, the gearing really has nothing to do with it unless you want to change it. Then you would need a new ring and pinion also
your best bet might be to look for a used complete unit and swap it out..
Im gonna be running 275/60/15's in the rear and wondering if i should change the gears and what vehicle would be best to find the used complete unit ???
But when burnout they will spin both tires ??Jegs and Summit racing sell 'Mini-spools' they basically replace the spider gears and you dont need to change anything. they fit in the origional carrier and since you dont pull anything other than the axles and spiders you dont need to set up gears or adjust gear lash. theyre about $120 if i remember brand new.
theyre not posi tho, they basically lock the axles together (think how a quad acts on asphalt) so anytime you turn the inside tire turns the same speed as the outside so it eats tires really fast.
i put a full spool in my car and i go through a new pair of tires every 4 or 5 months... so it gets pretty spendy, but it atleast guarantees both tires always get equal power and it always spins em both.
Which is better ??Go to a Salvage yard or ebaymotors, You need a 7.5, 7.6 or a 7.5/8 with a 26 spline axle. There are two factory styles cone style or Gov-lok. Heres a a photo of each.the
What do you recommend ?? a whole used unit from monte ss ?? or another 78-87 vehicle.I would go with ether one on a stock or mostly daily driver. I rebuild the 7.5 inch with new Auburn (cone style)posi in my 81 Malibu. My 78 El Camino has a used factory auburn (cone style)posi from a 87 Camaro. Some say the Aurburn is better because a gov-lok spins one tire then the other and on the street that has to be had on internal part of the governor. Dont run a spool on the street it will eat your tires and break axles.