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Old 04-16-2009, 11:38 AM
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Chev Auto to Early Hemi Conversion

Has anyone done one of these conversions? I've got a 1956 Dodge CRL 2dr HT with a 315ci V8 Poly (same block as the hemi, but with Poly heads). I really don't want to use the 2sp Powerflite that came on the car. They do make an adapter for the early hemi to a varity of trannys, like Wilcap (I believe) and Hot Hemi Heads. I want to cruise the freeways with no problem and am looking for much better mpg, so am considering an overdrive tranny. Recent disability has meant a cash flow issue. I do have an early 4L60e out of a '96 Corvette in my garage, so am wondering what any of you experts think about this swap? Hot Hemi Heads does make an adapter for this early hemi block to a 700r4, but the guy doesn't know if it would work for a 4L60e. He said if the 4L60e bolted up the same (bellhousing and torque converter) as the 700r4, their adapter would work.

Any thoughts on this guys?

Jay

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Old 04-16-2009, 03:33 PM
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The bell housing mount surface should be the same between the 2 different transmissions. Also compatible are the turbo 350, 350C, 400, and a few others. You will need to have a way to control the lock up torque converter. Hope this helps some.
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Old 04-17-2009, 08:07 AM
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I read somewhere that a guy used a lighted switch that reads "O/D" from a Nissan Maxima and wired the TC lock-up thru this switch and I think the brake switch so it would shut off if you hit the brakes. You just had to remember to shut it off manually if you reduced speed down to city driving or the engine would lug real bad and kind of remind you.
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Old 04-17-2009, 08:34 AM
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Quote:
Originally Posted by jsrail
Has anyone done one of these conversions? I've got a 1956 Dodge CRL 2dr HT with a 315ci V8 Poly (same block as the hemi, but with Poly heads). I really don't want to use the 2sp Powerflite that came on the car. They do make an adapter for the early hemi to a varity of trannys, like Wilcap (I believe) and Hot Hemi Heads. I want to cruise the freeways with no problem and am looking for much better mpg, so am considering an overdrive tranny. Recent disability has meant a cash flow issue. I do have an early 4L60e out of a '96 Corvette in my garage, so am wondering what any of you experts think about this swap? Hot Hemi Heads does make an adapter for this early hemi block to a 700r4, but the guy doesn't know if it would work for a 4L60e. He said if the 4L60e bolted up the same (bellhousing and torque converter) as the 700r4, their adapter would work.

Any thoughts on this guys?

Jay
The 4L60E requires a computer to operate it. The 700R4 (and identical 4L60 - without the "E") does not.
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Old 05-12-2009, 07:57 PM
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Quote:
He said if the 4L60e bolted up the same (bellhousing and torque converter) as the 700r4, their adapter would work.

4L60E and 700r4(and well any gm trans) will have the same bolt pattern, except for BOP and caddy v-8's

as long as both are from the same degree bellhousing engine

90 degrees(v-8, 4.3L, 229, 200, straight sixes

or 60 degrees
all GM 4 cyl, 2.8L, 3.1L, 3.3L, 3.4L, 3800, AMC 2.5L, etc.
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