![]() I probably won't start on this until winter but I'll let you know how it goes. I don't have a tig or a mig welder, I typically weld with OA and I don't trust myself welding a hardened shaft with OA and keeping it from cracking or warping. The input shaft into the overdrive is hardened, my guess is SAE4340 or similar steel so I feel more comfortable with brazing vs. Based on my equipment and my skill set, this is likely going to give me the best chance of success. My plan is to machine steel sleeves with a tight slip fit, ~0.004" diametric clearance to the propeller shaft and the input shaft to the overdrive and braze the shaft/sleeve assembly once I get the shaft lengths correct. Over a period of 40 years, Laycock Engineering manufactured over three and a half million Overdrive Units, and over one million of these were fitted to Volvo motorcars. ![]() The thing I'm most concerned with is coupling the cut shafts to the overdrive and keeping them good and straight. The āJā type Overdrive was introduced in the early 1970ās, and was adapted to fit Volvo, Triumph, Vauxhall Opel, American Motors and Chrysler motorcars and Ford Transit vans. It will require me to make new service and parking brake shafts so I can route them away from the new overdrive but this shouldn't be a problem. I just picked up a Laycock J-Type overdrive, Model 27.115952, that was in a box of parts I bought at an auction and have not been able to find any information on it. My plan is cut the torque tube positioning the overdrive so the front flange is just under the back of the cab, this looks like the best spot from a clearance perspective and should allow full suspension travel without interference. ![]() Well, it's looking like I will be tackling this myself. ![]()
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