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Bob Eyres · 03-14-2020

I don’t think that there should be a 14mph difference between speedo readings in a trans that has a stock speedo gear and 4.10 gears installed. You may want to double check with Marc about that to be positive you have the correct combination.
Those two “small computers “ next to the battery you mentioned are probably the primary and secondary injector drivers that interface between the computer and the injection system. It is VERY rare for them to need replacement. Without them your engine will not run well. Make sure that they are secure and in their original location to keep them away from contamination.
BTW, I also replaced my 89’ L98 6 speed coupe with a 91’ ZR-1.
My first reaction? OMG !!!!

Where are you located?

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03-14-2020	#18
Bob Eyres Join Date: Jul 2005 Location: Jupiter, Fl. Posts: 813	To buy or not to buy I don’t think that there should be a 14mph difference between speedo readings in a trans that has a stock speedo gear and 4.10 gears installed. You may want to double check with Marc about that to be positive you have the correct combination. Those two “small computers “ next to the battery you mentioned are probably the primary and secondary injector drivers that interface between the computer and the injection system. It is VERY rare for them to need replacement. Without them your engine will not run well. Make sure that they are secure and in their original location to keep them away from contamination. BTW, I also replaced my 89’ L98 6 speed coupe with a 91’ ZR-1. My first reaction? OMG !!!! Where are you located? Sent from my iPhone using ZR-1 Net Registry