I have a 74 J10 with a blown 360 and i have the opportunity to get a Buick 350 from a 69 Waggy will it bolt up? or do i need mounts and an adaptor? to make it work? Anything helps but the owner is going to scrap it pretty soon
No, it will not bolt up. A '74 Jeep TH400 has an AMC case that only works with AMC engines.
If you want just the engine - cheapest route would be to find a TH400 from a Buick (BOP pattern) and install the tail shaft from your AMC TH400. You need the Jeep tail shaft to work with your transfer case. The tail shaft is the last thing to come out of a TH400, so you'll need to do a complete tear down.
And the mounts will be different. And the radiator. Lots of details will be different.
Or get the complete '69 Wagoneer and use everything - engine, transmission and transfer case. That way you get rid of your QuadraTrac and replace it with a Dana 20.
Thank you for replying so fast. I will see how much he would sell it all for. With the 350 would it be best to fabricate some mounts? If i found a good 360 or a 401 and a dana 20 would i still need to do a complete tear down to the the tail shaft? Or is just the th400 to dana 20 adapter needed? My current 360 has a spun cam bearing with metal shards all over the pan and in the oil pickup filter. Would it be worth it to scrap the block and go buy a good one for 3 to 4 hundred dollars instead of the 350? For the whole wagoneer he told me 750$ Let me know what you think
Last edited by Justins74J10; 03-07-2013 at 03:05 PM..
If you hae the Quadratrac now, you'll need to swap output shafts to go to a Dana 20. The ouput shaft for the Quadratrac is unique.
A used engine will be your cheapest repair, if you can find a good one.
If you want to rebuild and your 360 block is damaged, it will almost certainly be cheaper to find another core engine to start from. If just the cam bearing is damaged, clean the block and reuse it. Your machine shop should advise you about this at no cost. Take the block to them and ask whether it's ok, and if it will need expensive extra machining.
Likely you can take the frame brackets from the 350 Wagoneer and they will bolt on. The 350 Buick is a great engine, lots of torque - meant to move heavy Buick passenger cars. The main downside to the 350, as I see it, is that you'll have the wrong engine in the chassis, and the Buick setup has some quirks. Parts are less plentiful for the Buick-engined FSJs than the AMC-powered trucks; things like a radiator will be harder to source. Kaiser used an unusual adapter between the engine and the TH400 that was unique to Jeep, and it has its own torque convertor. If you need a torque convertor, you'll likely have to have your core rebuilt. There may be no source for new, compatible flex plates. Likely other issues. Things will be simpler if you stay with AMC.
Or, if you want to go all-out, find a Chevy 4x4 donor and replace the engine, transmission and transfer case together. The Chevy swap is pretty popular, and would likely sell easily if it were done well. You could go with a 700R4, which is more efficient than the TH400, and gives you an overdrive gear. And parts would be easy to find and cheap, as long as you keep track of what was used where.