86 el camino rear end gears

[LukeZ]

My 86 SS El Camino has the stock 305, a TH200-4R transmission with overdrive, and a 7.5in 2.56:1 rear end, 26 spline. I'm also pretty sure that it had a 2 series carrier. look at the link at the bottom. I'm looking to get 7.5in 3.73 rear end gears. I used the differential wizard on multiple websites, including ringpinion.com, and it gave me some gears to choose from that are 26 spline. I looked at all of them (even though this is the one that I want), and these all say 27 spline. Doesnt the spline count have to match the original, which is 26 spline? Or is my thinking wrong? I'm looking to do a painless, simple gear swap, but I can't figure this out. Any help is appreciated, thanks.

This is the webpage with the gears:
http://www.ringpinion.com/b2c/Produ...=Rear Diff - RWD&DiffId=201&Source=DiffWizard

 

[79 USA 1]

The 26 spline count is in reference to the spline count for the carrier and the axles.
The 27 count spline is referring to the spline count on the pinion.
If you replace the carrier the spline count of the axles must match the new carrier.
If you are just replacing the ring and pinion 27 count pinion should be what you are looking for.
If you are using the non posi 2 series carrier you will have to use gears designed for this (Thick ring gear)
I have stock 3.73's in my 88 Monte Carlo SS with the 200-4R transmission and it helps the 305 to get out of its own way.
I have 4.10's in my 79 Monte Carlo with a turbo 350 transmission and a 406 small block which keeps the local gas station owner in business.
Hope this helps

 

[bubbameano]

like this one
http://www.ebay.com/itm/7-5-Posi-26...GHT-/261872064420?hash=item3cf8ca97a4&vxp=mtr