Anyone have a lead on a 2.77 with disc brakes? I need to make a long road trip to L.A. for the next run to the coast event sponsored by pro-touring.com and my poor th400 won't be kind to my gas mileage with the 3.42's.
I have a 3.42 ten bolt to trade or cash of coarse..

 

My ears and eyes are now open for 2.77 rear end for Mr. Jackson

 

eh throw in the ten bolt 2.73's as well. probably a bit more common to find, as long as it has discs

 

Start saving. Man up and drive slow.

 

So if I find a drum 2.73 you dont wanna swap your brakes onto it???

 

I can check my 86 Roc and get back to you. It's got the stock rear in it. Is your rear a 4th gen or no?

 

no cuz i dont want to pull axles to put on backing plates just for a weekend getaway. When I get back into town I want to swap my 3.42 axle back in. I just want the 2.xx for out of town cruises, so I want an easily swapable rear end.

the axle in my thirdgen is a thirdgen axle, the wheels on it are correct offset. The 3.42 axle I have not in my car is a fourth gen rear end.

 

Oh okay Traviz. I'll keep an eye out for what you want. You want a known good rear end or you okay with a junkyard rearend? can pull the cover off and make sure all is good?

 

junkyards are fine

 

I'll check my rear on my 86 tomorrow and I'll let you know. Does anyone know which RPO code is for the 2.77 gears?

 

This ^ seems more logical.

Is the gas savings that much better from a 3.42 to a 2.77 or equivalent for this to even be worthwhile? I can see maybe if you had 3.73s or worse.

 

big difference. I went from 2.73 to 3.42's and that was with overdrive. w/o overdrive a lot of rpms for his engine and supercharger

 

it will be like a 700rpm difference yes its a big deal especially on a 400mile road trip.
Anyone else here in an L.A. Cruise for a weekend? its a really big deal.

 

when is that next event?

 

http://modesto.craigslist.org/pts/2775090112.html

i dunno what the gearing is. you can contact them.

 

Could be 3.08, 3.27 or a rare 3.45.

 

Rare? that sounds expensive!

 

Well, the G92 option on the 305/manual if you consider that rare.
'87 GTA 305's were the standard 3.08, autos the 3.27.
Pretty sure Travis wants 2.77/2.73 for it to be worthwhile.

 

yeah i know. i didnt know the gearing i just posted it up so he could find out. if he cant use it oh well!

 

Always lookin' out for others.

 

so not appreciated around here...!

 

You'll get used to it, haa.

 

Thanks for keeping your eyes peeled. not a good lead, but im still looking!

 

I've got a 3.23 large disc rear out of a 90 Firebird Formula that we ran in the 24hrs of LeMons. I know its not exactly what your looking for, but I live in Grizzly Flats, only about 55 minutes from you. Another option might be to just change gears & probably the carrier, keep all the shims with each unit & you could swap them out in an afternoon, not as easy as a 9" but no big deal. I don't get on the computer on a regular basis so if your interested just call Gregg at 642-9563.

 

found me a 3.08 posi thanks to a local member. thanks all!

 

2.77 would be better.

 

2.77 will still be had if found.

 

I've got one. My iroc came with 2.77's and I swapped in a 3.27 rearend years back, still have the 2.77 rearend minus brakes though. Not sure if it's of any use to you. It's in good shape.

Will

 

if his 3.08 has brakes on it that'd work out great Will...huh trav?

 

It's a 9 bolt, out of an 89 so it would accept the PBR backing plates or any others I would think

 

yeah he doesnt wanna have to swap backing plates so im sur ethat'd work for him. get it traviz!

 

very nice how much?

 

100 bucks? It's got about 90k miles on it, solid rearend. Axles are in very nice shape, had everything apart to inspect it. 2 covers, rear springs if you want them.

 

damn how am i not getting these notices on replies.
I will take it.
pm sent.

 

i already bought it. its 200 bucks now but its 25 mins closer to get soo...haha.

 

Do the 9 bolt and the 8.5 have the same length pinion snout?
I would think swapping an entirely different housing would mess with the driveshaft length.
Hopefully I learn something today.

 

well the easiest way for me to answer is. all third gen's use the same length driveline, manual, automatic etc. so the differentials are fine to use with whatever drive line you have.

 

Wow, that's wild. Gm should have done that from the get-go. When I swapped my 7.5" for an 8.5, I had to use a 1" shorter driveshaft approximately.

 

wait, srs?

 

I PM'd you Travis. It's yours if you still want it.

Will

 

just teasin you bro....

 

well the 8.5 is the 9 bolt? everything ive read or seen says you can use the same driveline in any auto/standard thirdgen. if I am wrong i would like someone to correct me so I do not give out misinformation.

 

As far as I know it should work. Hell people put 4th gen driveshafts and rearends in with no issue.

 

yeah i meant to say 4th gens too for that matter.

 

8.5 is GM's other 10 bolt, used in just about every other RWD cars and trucks.

 

ah okay thanks for the info. buddy. I could see a whole different design rear end being different for the driveline sure.

 

Dunno if ya got that rear end yet, but this one looks to be pretty solid.

http://sfbay.craigslist.org/sby/pts/3051526010.html

 

I JUST stripped my 2.77 ring gear and pinion out of my 9 bolt in favor of a 3.27. Wish I could help. Sorry bud. Ill keep an eye out tho.

 

7.75 is the 9 bolt