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Username Post: TH350 to 4l60 swap El Camino        (Topic#364808)
"10th Year" Gold Supporting Member
Posts: 3273
Age: 37
Loc: Utica ny
Reg: 04-13-10
04-02-21 06:32 PM - Post#2817361    

Hi All. A few years back I swapped my built 305 TBI into a 1978 El camino. Brought it right to life.
The TH350 transmission is tired though. I happen to have a 4l60 on hand from a v6.
I was wondering if it is too difficult of a swap.
I realize the tranny might not be as strong as one from a v8 but this is more of a sunday driver.
Am I correct in saying the 4l60 does not need a PCM?
It is not a 4l60E, Just a 4l60.
Thank you all.
Funds are kind of tight but would love to see it running this season

Old School GM fan FOREVER

Edited by rockfangd on 04-02-21 06:34 PM. Reason for edit: Incorrect year


Super Senior Member
Posts: 6413

Loc: paradise
Reg: 09-05-03
04-28-21 08:23 AM - Post#2818920    
    In response to rockfangd

i would think that if there is no plug connector there is no tcm. adjustment of the cable may be important. is it a mechanical speedo? driveshaft may be shorter and x member may be different. shifter may also be different. i would toss in a shift kit while its out.

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.

"10th Year" Gold Supporting Member
Posts: 3273
Age: 37
Loc: Utica ny
Reg: 04-13-10
06-11-23 08:39 PM - Post#2859085    
    In response to bobb

I never did end up trying a 4l60. Owner swapped the TH350 for a rebuilt and still cannot drive it. Has been one problem after another. It feels to me like it stays in 2nd gear. Will not shift.
I have had governor apart, new vacuum modulator, verified 15hg vacuum to modulator. Have not resolved the issue. been over 2 years without being able to drive it

Old School GM fan FOREVER

"18th Year" Platinum Supporting Member
Posts: 410
Loc: BLACK DIAMOND BAY(tomball...
Reg: 11-29-04
09-13-23 08:44 AM - Post#2862536    
    In response to rockfangd

if it has a tv cable, proper adjustment is paramount. there are some brackets on the market that take the thinking out of adjusting. good luck.

94 Z-28 Ram Air
75 El Camino SS (Betty)
76 el camino (Veronica)
77 El Camino SS (Getting a 454)
58 4 dr Yeoman (Nadine)
57 4 dr 150 (Dottie)
53 4 dr tradesman (Tupelo Honey)
and they're all....
Positively Fourth Street.


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