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Old 12-09-2010, 08:16 AM
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Default Chevy 350 Conversion Adapter Kits

Where is the best place to purchase adapter kits for a 350 engine and tranny conversion? Some of the vendors out there are really expensive. Here's what I'm thinking:

Currently have a semi stock 1964 FJ40 w/ 1F and 3 speed. I've switched to 4:11 front and rear '76 axles w/ disc brakes up front, a 2" lift, and full cage w/ seatbelts front and rear.

Thinking of putting in a '73 Chevy 350 w/ a TH350 that a friend has just pulled from his truck and willing to sell combo for $400. Engine is in good shape but friend had extra money and swapped in a brand new crate motor with 700r4.

Should I use his old set up with the motor and th350 combo or swap out tranny to a TH400, 700r, sm420, or sm465? My application is a DD at 65mph in the Colorado Rockies and moderate off roading with the possibility of taking rig to a more advanced off-roader. Keeping her stock went out the window the first time I tried going up I70. The 2F long block currently sitting in the garage is too expensive to rebuilt and I don't think it will pacify my HP needs.

One last thing- Stay with the original T/C or swap to a NP203 or NP208? I currently own a couple of 3-speed's with t/c's for spares.
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Old 12-09-2010, 08:44 AM
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Advanced Adapters is the best. I don't know how they compare price wise with others but their stuff works right and is top quality.

I'm not sure, but if you go with the NP transfer cases you may have an issue with the output shafts being in less than ideal spots in relation to your differentials.

If you go with an automatic it will give you the best performance off road if you go to bigger tires but stay with the 4.10 gears.

Lots of folks do the V8 swaps but you will have other concerns to address like getting a dual core aluminum radiator and electric fans. Seems like without that setup almost every V8 swap I've seen runs hot and starts to overheat when going up the passes.
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Old 12-09-2010, 09:03 AM
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I have a 350, SM420, Stock case combo. It pulls strong up I-70 and is very trail capable also. 36" tires and 4:11's in the diff.

AA engine adapter is good stuff, but stay away from their t-case mount and motor mounts. I recommend a custom mount for the motor and t-cases or you will have constant leaks if you twist up the frame, ask me how I know......

The week link in the set up above will be the stock t-case. If you can swing it drop a 4:1 orion in place of the Toy case.

The 420 acts like a 3speed on the street because 1st gear is such a granny gear you don't need it unless on the trail. If my rig was a daily driver I think I would put a Toyota 4speed behind the 350 and switch to the Orion 4:1.

To Randy's point pull the stock Radiator or you will be pushing past 220 doing 65-75 on I-70 or even C-470 for that matter.

It's a lot a fun.....good luck
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Old 12-09-2010, 09:09 AM
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After a little more research, the NP's are out the window. I'm going to buy an adapter and stay with my original t/c. However, I'm really struggling with which tranny to go with. Also, does anybody know if I can put a dual core aluminum radiator and electric fans in and mount the engine in approximately the same area as the 1F. The reason for the question is that I have an adapter plate for a 350 with original Toyota 3-speed tranny. I may just do this in the mean time while I decide on tranny's if I don't have to move the 350 forward and misallign the 3-speed.
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Old 12-09-2010, 09:16 AM
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Quote:
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Also, does anybody know if I can put a dual core aluminum radiator and electric fans in and mount the engine in approximately the same area as the 1F.
Not sure, as I still have the stock radiator, but now I trailer the rig so I don't worry about overheating on I-70......I am sure someone here knows the answer to your question about the radiator.

As for the transmission, if you are still considering the 420 or 465. FWIW, The 465 shifts alot smoother than the 420.
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Old 12-09-2010, 09:43 AM
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The 465 is the modern version of the 420, the 420 is an old truck tranny, thats why it shifts sort of clunky. The 465 is geared slightly higher than the 420 but not by much.

I have an FJ40 with the dual core aluminum radiator, electric fans and Vortec 5.7 with a TH400 tranny. You're welcome to come look at it and take measurements.

If you go to the IH8MUD website there are a bazillion threads there on doing these V8 conversions and where to mount things up.

One of the reasons for using electric fans is to give you the flexibility to move the motor rearward and not worry about water pump driven fan placement, plus the e fans move a lot more air.
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Old 12-09-2010, 10:26 AM
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So many options!!! I have a 4-speed Toyota in the garage and the only reason I haven't installed it is because the ratio in 4th is the same as the 3-speed. A non-synco first gear hasn't been a big enough reason to swap. Is the Toyota 4-speed strong enough to handle the 350 HP?
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Old 12-09-2010, 10:30 AM
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Quote:
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Is the Toyota 4-speed strong enough to handle the 350 HP?
Not sure....my 350 is pretty mild. 200HP/300FTLBS out of a 92 Buick Roadmaster.

I think if you have a high HP motor it will tear the driveline apart, but it sound like alot of fun while your at it.
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Old 12-09-2010, 10:42 AM
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My FJ60 has a split case and an H55F. I think the H55F is pretty similar to the later 4 speeds (only has a 5th gear added).

Engine is a Vortec 5.3 which I think is "rated" at 300 or so HP and 325lb-ft at sea level.

I have flogged it all pretty hard over the course of 4 years and it has held up fine... but I bet the motor is making way less than 300 hp at this altitude.

I bet that a True 350HP motor would probably be pushing it if you drove it hard.. (and why would you build a high HP motor and drive it easy?)
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Old 12-09-2010, 11:25 AM
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Keep in mind the 3 speed transfer cases are pretty brittle, if you're going to flog it hard with a built motor you are better off going with an Orion or Atlas T case.

You also better plan on installing longfield axles/birfs up front and chrome moly axles in the rear or you are going to get lots of experience swapping out broken junk on the trail.
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