Borg Warner 4 pinion diffs

[oioioioioi]

Is there anything available beyond the pintara 4.11s?

[townie :)]

I've had an extensive look around and could not find any at all.

[Greg Rust]

Is the BW 78 an 8" ring gear as Richmond gears do up to 4.62 if that's the case?

[oioioioioi]

Approximately, the ring gear is 198mm (7.8"), close enough?

Approx price?

[cracka]

more than you can afford, pal.

[Greg Rust]

www.summitracing.com

[oioioioioi]

Gayer than aids, nothing on offer for the old BW 78. Ah well, pintara gears it is then.

[Greg Rust]

Yea try here but the diff cover looks different

http://www.richmondgear.com/07Apdfs/page17.pdf

[oioioioioi]

Nah it seems to be an overlooked diff tbh, 9 bolt diff housing and 7.8" ring gear (apparently thats why its called the BW78).

Pintara (4.11) gears will probably end up costing $100, $200 for better ratio would have been nice but doesn't seem to be available.

[Greg Rust]

I have some 4.11 gears here but had planned to swap them into my new diff that has 3.45 currently as I will have 6 manual gears now.

do you have any 3.9's for swapsies?

[oioioioioi]

Almost, mine should be 3.7, fairly sure the 3.9s only came in GTS model R31 Skylines. i.e. there's only 300 of them around.

You don't really want 4.11s when you've got a 6-speed box anyway, thats just greedy.

[S_E]

Almost, mine should be 3.7, fairly sure the 3.9s only came in GTS model R31 Skylines. i.e. there's only 300 of them around.

You don't really want 4.11s when you've got a 6-speed box anyway, thats just greedy.

GTS was the only manuals with 3.9s, all the autos had also had 3.9s.

[crack]

anyone know if these borg warner 78 series diffs have 'master' rebuild kits available?
are there factory rebuild instructions / manual available?
what are the recommended pinion preload and backlash settings?
what is the correct method of setting pinion preload with a crush sleeve (as opposed to shims)?

(i'll phone a diff shop soon enough but wanted to know if anyone here knows in the meantime)

[Gassed250]

anyone know if these borg warner 78 series diffs have 'master' rebuild kits available?
are there factory rebuild instructions / manual available?
what are the recommended pinion preload and backlash settings?
what is the correct method of setting pinion preload with a crush sleeve (as opposed to shims)?

(i'll phone a diff shop soon enough but wanted to know if anyone here knows in the meantime)

shims it is but you need a case spreader to shim it correctly

theres not a master kit as such but all the parts to do the job are available

though i did just find this
http://www.justdifferentials.com/ind...oducts_id=1467