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Old 09-24-2004, 10:18 PM
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1985 Monte Carlo - Gears?

Does anyone know stock, what a 1985 Monte Carlo w/ 305 4bbl carb came with? NOT the SS?

As far as rear-end ratio?

It wasn't 3.42:1 was it?


Thanks!

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Old 09-24-2004, 10:19 PM
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most likely 2.70s
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Old 09-25-2004, 12:03 PM
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can anyone else confirm this?

What's the simplest way to change rear gear ratio? I was guessing I'd be good with a 3.42 or 3.73?
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Old 09-25-2004, 01:51 PM
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From the sticker on the car it says i've got a 2.29 Rear End Ratio... that sucks huh? 7.5" rear end.....

what can fit in there easily?
what's cheap?


what would YOU do?

=P
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Old 09-25-2004, 03:47 PM
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about a 1 1/2 years ago, I had the exact same problem as you.
I swapped out the 2.29 for a 3.42.
The car was WAY more responsive, no more bogging and it literally has 50% more torque at the rear wheels.
If you want even more bite you can go for a 3.73.
The only downside to either choice is highway fuel economy, but that's only if you don't have overdrive.
Oh, yeah and the burnouts aren't quite as cool (the car itself is moving, not just the wheels)
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Old 09-25-2004, 05:06 PM
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I suppose its easier to just change the whole rear end than to go into the gears? I hear all about having special tools to make sure there's no play in the gears after puttin them in to get everything all lined up etc?

the Monte SS has a 3.73 stock I believe.... either way, when I get a chance I'd like to change my 2.29 for a 3.42 or 3.73


not sure what's worth it tho

hassling with gears using new gears
or just putting in a whole new (used) rear end.
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Old 09-25-2004, 07:33 PM
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If you can get a whole axle assembly for cheap - go for it, much less work.
But, a ring & pinion should only cost you $100-200 from a boneyard, take the carrier (this is a must, 2.29s and 3.42-3.73s use different carriers) with it so you won't need new bearings and aligning the gears should only take 1-2 hrs.
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Old 09-26-2004, 10:13 AM
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You will love the change from the 2.29's to 3.42 or 3.73, I DID.

My 81 Malibu with the 7.5 and 2.29's didn't like the fact I put the 700R4 in front of it, I got an averaged 13 mpg, with the highest of 19 mpg.

I changed the gears to 3.73's for well under a hundred dollars, as most of the stuff I bought wasn't required (I lucked out BIG TIME), and I got the donor axle for $0. I am now consistantly geting more than 18 mpg.

I used the gears and carrier from the 1984 S-10 axle, I needed to swap the carrier spacer from the 'BU driver side to the pass. side, and used one of the spacers from the S-10 axle to fit into the driver side of the 'BU axle.

I mic'ed EVERYTHING and used a permanent marker to mark everything that needed to be measured with the possibility of re-use.

The 3.73's allow me to now utilize the overdrive, I am able to engine brake on long downhill grades (around here this is a must), I replaced my speedometer gears so the Speedo was accurate (I didn't need a red-and-blue reminder notice), I did it myself with encouragement from other members on here, and I researched the internet to find the exact step-by-step procedure as no instructions came with these used gears.

Look through a couple of pages in this forum and find my posts on this, I just did it on July 10th so it cannot be that far back.
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Old 09-27-2004, 02:23 PM
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Yeah, I was going to say that you could get some cheap gears out of s-10's if you pay attention to the combination, (4cyl auto) might be a inexpensive way to get gears.
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Old 09-28-2004, 09:55 AM
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Quote:
Originally posted by Jzarczyn
If you can get a whole axle assembly for cheap - go for it, much less work.
But, a ring & pinion should only cost you $100-200 from a boneyard, take the carrier (this is a must, 2.29s and 3.42-3.73s use different carriers) with it so you won't need new bearings and aligning the gears should only take 1-2 hrs.
I see guys on eBay selling 3.73 ring & pinions and 3.42's for like $50, etc.
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Old 09-28-2004, 10:27 AM
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$50 for new ones right? They go really cheap used, on ebay.
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Old 09-29-2004, 09:31 PM
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Yeah they say they're new...

hmm...


also on a 85 Monte Carlo...

i guess this has to do with transmission - rearend..

My speedometer used to stop at 33.... 33 MPH wouldn't read at 33MPH though, it would read at about 63MPH, which was okay, cuz all I had to do was add ~33 and i'd be good, but we all know those speedos only go to 85, so once I'm over 53 I'm screwed..

We tightened the speedo cable behind the speedo the other day, it was loose.. got one tire off the ground (happened to have a flat on one front tire and a spare on the other <DOH!> so I couldn't road test it).. it seemed to work fine..

then when putting the dashboard back on (i had a nightmare -- i had to take it off 4x after it was done because... well 1st time the idiot lights for brights, choke, check engine all got illuminated when the highbeams were on-- forgot the gasket that goes around that to prevent the reflection into the other holes.. then the..

SPEEDOMETER needle fell off.... had to go in and dig for it... -- i put it back on at zero-- thats where the trouble started.. (and after that i forgot the mirror button and the 4th time forgot to plug in the rear defroster!!)


now when i jacked it up--- seems to work OK... gave it a lil more gas... got it up to 65 or so....... when i hit the brake the needle stays at 45 now!! -- what's going on?

I just put a 40 dollar bid on ebay for a new speedo... hoping that would solve the problem... if not, well hell... I should've consulted u boys first!

-Pete
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Old 08-16-2005, 05:15 PM
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Go on MonteCarloSS.com they have everything you need to know about your MC.
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