MONTE CARLO GEAR RATIOS... Huh?!?!

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pontiacgp

blank
Mar 31, 2006
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20,397
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Kitchener, Ontario
take a look at the pan on the transmission

auto_trans_id.jpg
 
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The Last Don

Greasemonkey
Oct 22, 2017
106
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Seattle, WA
Put a floor jack under the center of the axle. Block the front tires. Jack it up. With the emergency brake off and the car in park and both tires in the air, try to spin one of the tires by hand.

If it doesn't spin freely, you have a posi.

Turbo 400's don't use the same kickdown process as the factory trans (200-4R, TH350's, 700R4's use a TV cable). TH400's use a switch. You need a TH400 kickdown kit. Check summitracing.

Put rear up in the air... Caused an eclipse... JK! Spun the rear wheels and they spun freely... Dammit!
 

MrSony

Geezer
Nov 15, 2014
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383_GrandPrix

G-Body Guru
Sep 9, 2016
678
1,311
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Quebec, Canada
A properly rebuilt th200-4r is actually a nice thing to have. The th200-4r is a 4 speed / overdrive trans which would allow you to run numerically higher gears and not be running at crazy RPMs on the highway. Now that we know the trans isn't what the previous owner said it was (not all bad), it's time to check casting numbers on the engine to see if it is truly a 350, or a hopped up 305.
 
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