12/5/2023 0 Comments 700r4 transmission gears![]() ![]() So I turned the housing a bit in the transmission till the gears meshed and I could no longer turn the speedo gear with the screw driver tip. I could freely spin the gear - no contact between the gears. Got a square drive screw driver tip (you know, those security screws/screwdriver tips?) and stuck the right sized tip into the end of the speedo gear and put the housing back in the transmission. The junkyard piece fit the transmission, but the hole for the cable wasn't in exactly the same place in relation to the old/broken piece, so the speedo gear was not engaging the gear on the drive shaft. I jacked it back up, pulled the piece out and really got to looking them over. Only a couple fit (that diameter thing) but I took one that was the right size and installed everything, let the car off the jacks and went for a test drive - DARN!! speedo still didn't work (computer controlled fuel injection cars act funny - engine shuts off at the wrong time - without speed indication) so I really needed a working speedo. I got several (3 or 4) off 700r4s at the junkyard, none of them IROC Z28's, but a combination of 700r4's in S10 Blazers, full size vans and a car or two. I found the housing that fits into the driver's side of the transmission broke and it no longer held the speedo gear in the right position to mate up with the drive gear on the output shaft.Ĭhevrolet told me sorry for my luck, I'd have to get one at a junkyard as they no longer stocked the parts I needed. While I've not gone from 350 to 700r4 I've had issues with my 86 IROC with a 700r4.
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