BADASS of New England

An automobile club for the enthusiast who enjoys the last of the big GM cars. The rear wheel drive B and D bodys. Chevrolet Impala SS, Caprice, 9C1, Buick Roadmaster, Oldsmobile Custom Cruiser, Cadillac Fleetwood
 
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 3.08 swap to 3.42

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MASShole9C1



Posts : 4211
Join date : 2009-12-16

PostSubject: 3.08 swap to 3.42   Sat Dec 19, 2009 4:48 am

Help me see the light at the end of the tunnel full of bull sh$t. I'm going to be doing a rear end swap in my '96 9C1 with a set of 3.08's. I've found a '94 9C1 parts car with a rear that has 3.42's. correct me if I'm wrong, but wont I get worse gas mileage with the 3.42's? But the response from the gas peddle will be better in the city and help me forget about my wallet? I'm not sure if I should swap it in temporarally(to have the 3.08 rebuilt) or keep it in and not swap it back out once (dwindling)funds rebuild the 3.08's in the spring. Discuss...
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PostSubject: Re: 3.08 swap to 3.42   Sat Dec 19, 2009 6:19 am

Just swap rearends if you can. 3.42S are going to hurt fuel milage, because with them in place, you are going to be on the go pedal alot more. Go for it, or wait it out for some 3.73s.
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MASShole9C1



Posts : 4211
Join date : 2009-12-16

PostSubject: Re: 3.08 swap to 3.42   Sat Dec 19, 2009 6:43 am

It's a good thing my '96 isnt going to be my daily driver then, given the 3.42's. The speedo is gonna be all messed up, so my GPS will have to substitute.
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toomanytoyz
Club President


Posts : 6870
Join date : 2009-01-20
Age : 40
Location : East Hampstead, NH USA

PostSubject: Re: 3.08 swap to 3.42   Sat Dec 19, 2009 9:23 am

Screw those wussy gears! Go 4.10's!!! Very Happy








(yeah, I know, the 3.42's are free. Wink just swap in the whole rear. Either I or a few others could fix your speedo with a lappy)

_________________
Bill "The Verb" Crovo - Resident Car Slut & Unicorn Hunter

A Toasted Marshmallow, A Long German, A Lame Suburban and expensive dreams...
Missing all my previous B's, D's and V... Sad
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www.badassofne.net
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NO MORE UNICORNS!!!!!

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bammax



Posts : 2301
Join date : 2009-02-22
Age : 35
Location : Mansfield, Ma

PostSubject: Re: 3.08 swap to 3.42   Sat Dec 19, 2009 9:24 am

The higher the number the higher the rpm's when cruising on the highway. That makes for worse mileage and more wear on the drivetrain. For around town your mileage may not change that much since the car is getting more "off the line" ability which translates into less power needed to move from a stop.

And I'd suggest getting a tune done at some point to take full advantage of the changes being done.

And don't forget that when you swap gears out from the housing you need to swap in a new abs reluctor to match the gears. That's one reason why it's easier to swap entire rear-ends.
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MASShole9C1



Posts : 4211
Join date : 2009-12-16

PostSubject: Re: 3.08 swap to 3.42   Sat Dec 19, 2009 2:28 pm

Thats what I'm doing. Swapping the entire rear end. Nothing comes for free. $600 for the whole pile with an LT1(already sold)/with tranny(sold) and I had to come up with 4 wheels and tires. But I guess I will stick with the the whole swap then, and meet up with someone to program it!
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boojum



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Join date : 2009-01-21
Age : 29
Location : NH

PostSubject: Re: 3.08 swap to 3.42   Sat Dec 19, 2009 4:02 pm

IIRC before the crash there were a few people on that other forum that went with 3.73s and city mileage improved.
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MASShole9C1



Posts : 4211
Join date : 2009-12-16

PostSubject: Re: 3.08 swap to 3.42   Sat Dec 19, 2009 5:03 pm

boojum wrote:
IIRC before the crash there were a few people on that other forum that went with 3.73s and city mileage improved.


I will have to read up on some of that. My Monte Carlo SS has 3.73's, but that car gets terrible gas mileage as it is...
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sdstick



Posts : 4278
Join date : 2009-03-20
Location : Revere, MA

PostSubject: Re: 3.08 swap to 3.42   Sat Dec 19, 2009 8:32 pm

IMPALADAKID wrote:
......you are going to be on the go pedal alot more.
Bill hit the nail on the head here^^
Around the city your going to see better mileage IF you stay off the pedal
High RPM will eat more fuel

_________________
Steve


96BBB 28K 3.42 Bolt-ons
95BBB 100K 3.73 383 New DD...already broke fixt the 4L60E twice
95 Black WB4 Hole...ee...grail
96 Black WB4 No holes in this
95BBB 189K 3.08 Old DD Stolen...by Matt. Cool
Whine..eee...Silver LS6
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MASShole9C1



Posts : 4211
Join date : 2009-12-16

PostSubject: Re: 3.08 swap to 3.42   Sun Dec 20, 2009 1:20 am

Awsesome! thanks for all the help. Learning has occured cheers cheers
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