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SeventyOne · 07-08-2021, 03:33 PM

4L60e is just an electronic version of the 700r4.

4L60e will need wiring and a computer/ecu to work. 700r4 needs a Throttle Valve cable attached to the carb throttle blade.

If you want simple I'd go 700r4, get it built with the proper output shaft from Advance Adapters to mate right up to your NP205 Tcase. Get a Bowtie Overdrives TV cable kit to handle that part.

You'll have to either move your engine forward or the trans/tcase back to accomodate the 700r4's increased length over the Th350. It's 1-7/8". I personally moved my engine forward. You can keep you existing driveshafts this way and it gives move clearance at the firewall for valve covers and the distributor.

Another option for Overdrive is to install a gear vendors OD unit on the end of the Tcase. I dont have much info on this but it is an option.

07-08-2021, 03:33 PM	#2
SeventyOne Registered User Join Date: Mar 2007 Location: Oakland, Ca Posts: 1,370	Re: Blazer Overdrive 700R4 or 460LE 4L60e is just an electronic version of the 700r4. 4L60e will need wiring and a computer/ecu to work. 700r4 needs a Throttle Valve cable attached to the carb throttle blade. If you want simple I'd go 700r4, get it built with the proper output shaft from Advance Adapters to mate right up to your NP205 Tcase. Get a Bowtie Overdrives TV cable kit to handle that part. You'll have to either move your engine forward or the trans/tcase back to accomodate the 700r4's increased length over the Th350. It's 1-7/8". I personally moved my engine forward. You can keep you existing driveshafts this way and it gives move clearance at the firewall for valve covers and the distributor. Another option for Overdrive is to install a gear vendors OD unit on the end of the Tcase. I dont have much info on this but it is an option.