PCM help!

[whytry85]

ok guys, i jsut recently bought a 96 chevy 1/2 ton that already has a nelson tune on it. it also has 4.10 gears in the rearend and my speedometer is 15 mph too fast. so my question is would it be ok to buy a superchip and install it? The only reason i ask is becuz i would like to recalibrate the speedometer with the superchip and didnt know if it would affect the Nelson tune. (flash back to stock). let me know guys.

Thanks,
Darrell

[ant8624]

i think thats a no no...

[whytry85]

yeh thats kinda what im thinking. is there any other kind of calibration kits i can get to correct my speedometer? thanks for any help...l

Darrell

[trentphipps]

can you send it to nelson? or contact the original owner and have them send it.? thats a big no no dont do that after u have a tune....

[red4x4chevy]

Actually correct me if i am wrong but when you connect a tuner up it saves what it reads on the computer as the stock tune and saves it so if you wanted to go to stock you can at a latter date. So it would think the nelson tune is the stock program just use it to correct the speedo and DO NOT change any of the performance parameters.