Their answer should be along the lines described here. If you are purchasing a high performance vehicle with a significant tire size change from OEM, be sure to ask the seller what he / she did to correct the speedometer inaccuracy. Parts alone for this aspect cost just a little over $100.00 but it is money well spent to have an accurate speedometer reading.
Chevy turbo 350 transmission fluid capacity install#
The folks at PATC recommended that I install a Ratio Adapter with a slow down rate of 17.6% to solve the problem, and this is what I did and the adapter is shown in PHOTO M 13 H. This new combination of gears now put the speedometer 13 MPH too fast. In the case of this truck, the new Drive Gear and the Driven Gear I purchased from PATC equaled 10 and 22 teeth respectively.ĭue to the tire size on the truck, this was the most we could go as far as internal speedometer gearing in the Turbo 350 because of the limited availability of Drive and Driven gears available. However, thanks to the people at PATC Transmissions in Bossier, LA, this arduous task was made just a little easier. When I took the truck out for a road test after installing the transmission, the speedometer was reading 25 MPH too fast and, of course, this is a condition that required correction and it was not going to be an easy task. No high performance transmission job is complete until the speedometer reads correctly and, rest assured, this is a tedious task when not working with original equipment transmission parts and increased wheel size. The main reason for this of course is that there are no oil / fluid leaks with the mechanicals and, as I said, the truck is not driven in foul weather.
Not to point out the obvious but one can surmise from the photos of the under carriage posted on this web site that this truck does not get driven in the rain if at all possible.Įven though it could be a daily driver, the C10 is really a weekend fun machine and being that the build of this truck was not a frame-off, one can plainly see that this C10 is fairly clean underneath for being a weekend driver. exhaust wrap has been installed on the exhaust pipes along with Thermo-Tec thermal barrier material within the transmission hump of the floorboard of the truck. Note that the the Design Engineering, Inc. PHOTO M13 F shows the The High Performance 350 Turbo-Hrdramatic automatic transmission installed in the 1971 Chevrolet C-10 pickup.
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