Can I use a 4L80 trans?
I’m beginning to consider changing out my TH350 trans for one of the Following.
1.700R4 2. 4L60 3.4L80 What are the Pros/Cons of each, in regards to Electronic Wiring and reworking, Trans Tunnel clearance or modifications required, Crossmember mods, and Driveshaft requirements. I’m considering the changeover to one of these Transmissions, for the advantages of OD on the Highways. Any advice is welcomed |
Re: Can I use a 4L80 trans?
It depends on how much horsepower that you have? If your engine is 500 horsepower or less. I would recommend a 700r4 from Phoenix Transmission. All you do is pick up the phone and call Phoenix Transmission, tell them what your truck information, motor, rear axle ratio, tire size, what the trucks purpose is? Towing or daily driver etc.. They will build the transmission to what you need, easy install with just a driveshaft shortened. Very good people to deal with and reasonably priced. A 4l80e will fit if your truck has the high jump floor otherwise you have to modify and you need a controller to run this transmission as well as a 4l60. Extra cost! I hope this helps your situation. Thanks Chuck
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Re: Can I use a 4L80 trans?
Good info C101972. I've read good things about Phoenix Transmission in TX. I love my 700R4 - got lucky and had one built locally by an experienced GM transmission rebuilder. I swapped it for a TH350 with a mild SBC 350.
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Re: Can I use a 4L80 trans?
Yes, what C101972 said, a 4L80 is way overkill in these trucks. A 700R4 with the torque converter lock up kit works great in my truck.
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Re: Can I use a 4L80 trans?
Second that on torque converter lock-up - it's like having a (tiny) 5th gear! My builder had an older style 82-89(?) valve body that supported the hydraulic lock-up kit, so no additional electrical wiring, brake light switch w/cruise control leads, low-vacuum switch or solenoid needed on my 700R4. I believe this is the kit he used:
https://transgo.com/product-details/...aulic-lock-up/ |
Re: Can I use a 4L80 trans?
All these responses are. Great! This is just the information I needed.
Now I look for a 700r. So there’s no electronic box or wiring needed? What about the mount and drive shaft length? |
Re: Can I use a 4L80 trans?
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No electronic box needed for 700R4. However, depending on the set up you may need to run a 12v power lead to the lock up solenoid. There are a couple of threads on the forum that cover this. Here's a pic on the transmission lengths. You will likely need to cut down the drive shaft, as I had to since my TH350 was the short tail shaft version. I had my local Inland Truck Parks cut and balance a spare 2-piece drive shaft and install a new carrier bearing after getting the transmission and measuring a couple of times to be sure of what I needed. I was able to slide the transmission mount back about 1" (if I recall correctly) and drill new holes using an extended drill bit to reach the upper rail. Based on the diagram, the 700R4 mount is about 3/4" further back from the TH350 mount.
Also, you will want a later 700R4/460L version (87-93 I think) as they were better built and had 30 spline input shafts (vs. 27 spline on earlier versions). My core is from a '92 Caprice. |
Re: Can I use a 4L80 trans?
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Re: Can I use a 4L80 trans?
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Re: Can I use a 4L80 trans?
And just to clarify a couple points.
A 4L60 is basically the same as a 700R4. Hydromatic updated the Chevrolet design by adding a forward accumulator and a couple other modest tweaks in mid 1987. Pickup trucks but not cars in 1993, electronic shifting and pressure controls were added and the the transmission became the 4L60e. No more governor and the electrical connector moved to the passenger side makes it easy to identify externally. Needs a computer, throttle position sensor and vehicle speed sensor to operate. The 4L80e had always been electronic shifted and is, more or less, a TH400 (3L80) with an internal overdrive section added |
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