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Discussion Starter · #1 ·
I have a buick TH400 in my 87 gn and my question is does anybody know where i can order something to make my speedo read the correct mph for my direct scan? Its off about 10 to 15mph any info would help alot. usa uzi silly
 

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Find a trans shop and get the speedo gears changed[in the tailshaft housing].
 

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Discussion Starter · #3 ·
what do i ask for?will the speedo being off alot effect the direct scan info im going to send Jim Testa for a now chip? usa uzi silly
 

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tell them you have the wrong gears and you need the right ones for your tire height/rear end ratio.

I doubt that Jim will care one way or the other. Ask him. It will affect the tcc lock up, tho, so you need to fix it before he makes the chip.

<small>[ March 27, 2003, 01:56 PM: Message edited by: Steve Wood ]</small>
 

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Discussion Starter · #5 ·
steve wood,
what is the (tcc lock up)?
 

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Discussion Starter · #6 ·
or anybody usa uzi silly
 

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torque converter
 

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Discussion Starter · #8 ·
im wondering how will that effect the torque converter lock up?
 

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the chip tells the converter when to lock up. If the speed reported to the ecm is not correct, it will not lock where it is supposed to
 

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Discussion Starter · #10 ·
its a 400TH TRANS it isnt a 2004R electronic trans
this 400TH has a fully manual valve body.the 2004R
i had about a day bilt from hell and back spit the plantary gears out the bottom so $2500.00 down the drane eek! .i put a BOP 350TH in the 87 blow it up so i got a old buick land barge took the 400 out of it and bilt it to hold.it hasnt let me down yet so back to the subject i really dont see
the STALL being effected considering its fully manual.
 

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you are right.

<small>[ March 28, 2003, 02:36 PM: Message edited by: Steve Wood ]</small>
 
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