40th anivesary swap into 90 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 04-08-2011, 08:23 PM   #1
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Default 40th anivesary swap into 90

Im thinking of getting a 97 SE 40th Anversary Bonneville parts car. Side swipped down the whole side but has a 52k na motor. Tires have 2000 miles. The guy selling it is retired and it is his mothers car, so old lady to church and all that.
I'd like to swap into my 90. New tires and crome blades that came on the 40th. Rather than putting 3.06 gears in my tranny i can just drop the entire cradles out.

Anyone know what gears the na 40th would have come with ?
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Old 04-08-2011, 10:09 PM   #2
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97 would be 4t65-e trans IIRC
ANd you have a 4t40 or 4t60 Not sure exactly how they would line up in terms of mounting?
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Old 04-08-2011, 10:32 PM   #3
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computers not gunna like alot of things unless you buy a obd2 tuner that you can turn the tree hugger junk off, you would still have to convert a few things to obd2.
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Old 04-09-2011, 02:57 AM   #4
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Aha ! But when you drop the eng cradle with the eng trans struts brakes and computer you wont have all the problems. Thats the reason for buying a complete running can instead of trying to mismatch eng'* and transmissions. No reason to buy a better tranny and not use it. Besides all te guys doing the SC eng swaps are not keeping there old tanny'*.
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Old 04-09-2011, 03:02 AM   #5
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I know the computer is no on the cradle but i'll have the entire car to pull the computer and harness.
I'm not trying to ba a jerk but i do realize i only said engine. Just that it'* mileage is a selling point.
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Old 04-09-2011, 03:07 AM   #6
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im doubting the 1997 cradle will bolt right up, they r differant body styles, and there are other differances than just appearance. and the challange of running a Series II in a car that came with a "non" Series 3800 is gonna be time comsuming
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Old 04-09-2011, 05:19 AM   #7
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Same cradles. 97 cradle even has LN3 mtr mount holes. If you search on here you'll find people talking about it.
But still not sure i'll actually do it. Still have my 92 Regal L27 mtr and 4T60 trans not 4T60-E , ran the vin. My 90 is LN3 and 4T60 also ran the vin. The Regal has 3.06 and way more responsive and quicker than the Olds with 2.84 gears. They both get at least 25 on the highway.
No one has said if i can use the L27 intake on the LN3 . Does the TB bolt and work ?

I'd want to port the L27 heads and intake.
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Old 04-09-2011, 11:50 AM   #9
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I already have a 99 Regal GS . SC motors like hi-octange and lots of it. The Regal runs great, cmfotable and fast too expensive to fill. My 90 gets way better mpg'*.
Besides i also have a lifted 92 Jeep Cherokee with a 32 gal tank. It gets pretty good on the hywy. 20-22 if you dont fill up the tank. Normally i put about 20 gal in it unless i'm going really far and get the gas cheap. It has a 2000 mtr swapped in just recently.

Lots of mostly factory upgrases including rear disc brakes. There are even a couple jeeps or more running the Camaro/firebird 3.8 and any other motor you can think of.
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Old 04-09-2011, 12:05 PM   #10
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I have a 40th with the 3.06 ratio.
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