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02-07-2023, 08:43 AM
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#1 |
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Designated Grumpy Old Man
 
Join Date: Oct 2001
Location: arlington, washington usa
Posts: 3,091
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4 speed to automatic
My 68 1ton has a 4-speed manual transmission with 5.38 rearend. Because I'm losing the use of my left leg, I'm unable to operate the clutch. I know that a Turbo 400 trans is a good fit but, I would like to find an overdrive automatic that would handle heavy loads.
Any good suggestion? Thanks, in advance.
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Never let the truth get in the way of a good story 71 Chev 1/2 ton 4X4 LWB Fleetside SOLD http://67-72chevytrucks.com/vboard/s...d.php?t=361222 http://www.youtube.com/watch?v=1LgREwtDfaA 68 Chev 1 ton flat bed http://www.youtube.com/watch?v=0bO8szzlD4A 56 Chev Handyman Wagon http://www.youtube.com/watch?v=9y-6ddpBTkM http://www.youtube.com/watch?v=lbLzZ7zY8wA 56 Chev Belair http://67-72chevytrucks.com/vboard/s...d.php?t=410667 http://www.youtube.com/watch?v=xoW0Ei7ZNIg |
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02-07-2023, 10:11 AM
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#2 |
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Registered User
Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 2,131
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Re: 4 speed to automatic
A 4L80E is basically a TH400 with overdrive. Looks like you can get a stand-alone controller for $300+. The 4L80E has a .75 overdrive so that would put you right about 4 in overdrive with your 5.38 rear gears. Not too bad a swap I wouldn't think. Flexplate, starter, radiator, cooling lines, crossmember, driveshaft. Have to figure out a shifter. Floor shift is probably easiest.
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'83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project |
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02-07-2023, 10:19 AM
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#3 |
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Registered User
Join Date: Jul 2018
Location: Catskill Mountains,NY
Posts: 8,139
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Re: 4 speed to automatic
I would go with the 80 myself .
I’m looking to go the other way I want to put a Muncie or Tremec behind my 327 in my 68
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Mark 72 c20 custom camper Husky edition, 66 SS396 Chevelle 1964 Hawk, 63 Avanti,62 lark 1969 AMX , 1968 c20 stepside ,85 K20 1977 Suburban sold 68 anniversary. |
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02-07-2023, 02:00 PM
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#4 | |
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Senior Member
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,389
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Re: 4 speed to automatic
Quote:
Yup--5.38 x .75 = 4.03 perfect for the 1 ton at freeway speed |
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02-07-2023, 02:05 PM
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#5 |
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Registered User
Join Date: Apr 2009
Location: PNW
Posts: 553
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Re: 4 speed to automatic
No need for a controller in the 4L80Es anymore. You can go manual valve body (manual shift w/o need for a clutch).
https://shop.jakesperformance.com/sh...al-control-box |
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