The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

rfmaster · 06-29-2007, 10:40 PM

Ehman

I converted from TH350 to 700R4 last year.

When converting to 700R4 or 4L60(e) I would strongly suggest to go through 'soft' parts before installing into your truck. The donor vehicle for my 700R4 was a 1990 'burban with about 65k on the odometer. The transmission shop that build my transmission noted that trany was close to blowing 3-4 gear clutches - a common weak point in 700R4's.

I chose to spend about $600 in heavy duty parts to avoid such future fate. As a side note 4L65E is the updated, heavy duty version of the 4L60E found behind 03+ LS engines. Most of '65e parts can be used in earlier transmissions. For more information check out Super Chevy article:
http://www.superchevy.com/tech/0311s..._transmission/

You can also find my parts list in one my earlier posts.

In my driving experience 700R4 performs just fine - my 350 mill is very mild and most of my driving is light cruising. The gas mileage went up from dismal 11.5 mpg to 15 mpg during extended highway run (over 150 miles at about 65-70 mph). This is what I was looking for and got it with this swap. For heavy duty towing or having serious 'fun' I would step up to 4L80e.

//RF

06-29-2007, 10:40 PM	#4
rfmaster Registered User Join Date: Oct 2003 Location: OC CA Posts: 1,374	Re: 4l60e question Ehman I converted from TH350 to 700R4 last year. When converting to 700R4 or 4L60(e) I would strongly suggest to go through 'soft' parts before installing into your truck. The donor vehicle for my 700R4 was a 1990 'burban with about 65k on the odometer. The transmission shop that build my transmission noted that trany was close to blowing 3-4 gear clutches - a common weak point in 700R4's. I chose to spend about $600 in heavy duty parts to avoid such future fate. As a side note 4L65E is the updated, heavy duty version of the 4L60E found behind 03+ LS engines. Most of '65e parts can be used in earlier transmissions. For more information check out Super Chevy article: http://www.superchevy.com/tech/0311s..._transmission/ You can also find my parts list in one my earlier posts. In my driving experience 700R4 performs just fine - my 350 mill is very mild and most of my driving is light cruising. The gas mileage went up from dismal 11.5 mpg to 15 mpg during extended highway run (over 150 miles at about 65-70 mph). This is what I was looking for and got it with this swap. For heavy duty towing or having serious 'fun' I would step up to 4L80e. //RF __________________ "The Beast" 1975 Chevrolet C20 longbed 350/700R4! with 3inch body lift Dual Flowmasters Super 40's! TBI retrofit completed (2007-07-29) New 383CID (+030) 08-304-8 9.5:1CR x36,005 (2012-12-17)