1989 SE using a 1987 Tranny - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 06-14-2004, 02:37 AM   #1
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Default 1989 SE using a 1987 Tranny

I just killed my 1989 Bonnie SE Tranny Th440T4 i think?car is at 140,000 miles
Well,about 3 months ago..I noticed it shifted kind of late,and i heard LOUD clunging noise when i put in in D or N,or R...so i was driving it and i took 2 minutes at 4,000RPM to shift into 2nd and about the same to 3rd and i got filter change,and fluid.
I know im a teenager,i did a little rollback..knowing the tranny was on its way out.Left a nice strip..the first strip i ever left with my car.
And about 2-3 hours later..I was went to pull of out my Girlfriends house,and i hear a bang.I step on the gas...car aint movin no more..and i put in all the gears,and in drive..it makes loud high pitched clicks,like its movin in drive.Its pouring Tranny fluid out of it,and its almost BLACK btw,

I bike 6 miles to a junkyard and they tell me that they have a 1987 Bonneville Tranny for me.Is that tranny gonna fit in my car?i looked at the fliud,almost bright orange and the car has 70,000 miles on it.
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Old 06-14-2004, 03:08 AM   #2
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A godd tranny will have PINK fluid, not orange. Orange is bad.

I don't know about 87-89 tranny interchangability.
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Old 06-14-2004, 03:23 AM   #3
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It'* physically the same, Some of the sensors may have to be swapped.

Didn't the pinouts on the gear indicator switch change right in there somewhere?
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Old 06-14-2004, 10:04 AM   #4
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I though bright orange was a good thing....
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Old 06-14-2004, 06:52 PM   #5
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So I defintly should NOT put this transmission in my car?...
would i be able to put in my car ?...im just wondering?
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Old 06-15-2004, 02:20 PM   #6
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ok...

would the car drive if i put that transmission in?..

im thinking it has no overdrive cause one is 4 pins and one is 5 pins for the overdrive?..
anyone care to enlighten me on this matter?
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