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Old 04-01-2019, 09:53 PM   #1
hb32
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Manual to automatic transmission swap

Don’t want to but the towing capacity with my NV3500 is less then the weight of my trailer so need to swap for a 4L60E. Besides the transmission, driveshaft alteration, module or computer for the transmission, what else do I need to consider. Truck is a 97 GMC regular cab short box with a 305 which I am happy with. Looked at an LS swap but don’t want the hassle that comes with it. Haven’t found much in the search on here either.
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Old 04-02-2019, 04:11 PM   #2
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Re: Manual to automatic transmission swap

4L60E is not much better than the NV3500. I have found the biggest limitation was the clutch disc/pressure plate. I have seen way too many 4L60Es die from towing. What are you towing and how often. If it is a lot of towing I would go to a T400 or a 4l80
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Old 04-02-2019, 05:05 PM   #3
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Quote:
Originally Posted by Palf70Step View Post
4L60E is not much better than the NV3500. I have found the biggest limitation was the clutch disc/pressure plate. I have seen way too many 4L60Es die from towing. What are you towing and how often. If it is a lot of towing I would go to a T400 or a 4l80
Trailer weighs in @ 4300 lbs dry so figure 5k
Not a lot of towing and not long distance or major inclines.
What clutch would you recommend?
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Old 04-02-2019, 06:48 PM   #4
AussieinNC
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Re: Manual to automatic transmission swap

Suggest you look at dual friction plate clutch systems will provide twice the clamping area giving you much more torque capability....$ around $900

IMO...stay away fro 4L60....if you must go auto, go with 4L80e but have it built for towing....and absolutely replace the input shell gear with an upgraded one....$ around $3500 plus everything else you need.

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Old 04-10-2019, 08:45 PM   #5
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Re: Manual to automatic transmission swap

Why not nv4500?
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Old 04-11-2019, 12:22 AM   #6
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Re: Manual to automatic transmission swap

Quote:
Originally Posted by Tom View Post
Why not nv4500?
Thinking of that as well. I have ordered a HD clutch and will see what that does for me.
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