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Old 07-18-2011, 08:08 AM   #1 (permalink)
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Mini truck 4 speed swap to 5 speed

I want to swap a Toyota 5 speed into my '81 mini truck, which has a 4 speed. I'm looking for info from anyone that has done this. Any problems encountered, etc. Did 2 searches, found nothing. Maybe I'm using the wrong key words? Thanks for your time.
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Old 07-18-2011, 08:38 AM   #2 (permalink)
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Do you know which 5 speed you wish to install?

The most common is a w56 from 1984 to 1995 from efi vehicals. These are stronger than anything from 80-83. But, they are longer and require driveshaft and crossmember modification. There is a few other options as well.

here's a link to pics of different models.
http://www.marlincrawler.com/transmi...built-complete
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Old 07-18-2011, 08:58 AM   #3 (permalink)
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I recently did this swap. If you get a L50 or L52 transmission it will bolt right up. Other toyota trans will be longer and require crossmember and driveline mods.
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Old 07-18-2011, 09:15 AM   #4 (permalink)
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Yes, this trans came out of a mid eighties 4 runner. It is approx. 4 inches longer. I don't mind the driveshaft mods because I need to lengthen my front driveshaft anyway to get a better angle. I was told that when I do this swap that I need to upgrade my transfer case input shaft to a 23 spline unit from a 21 spliner.
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Old 07-18-2011, 10:00 AM   #5 (permalink)
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Quote:
Originally Posted by Power Giant View Post
Yes, this trans came out of a mid eighties 4 runner. It is approx. 4 inches longer. I don't mind the driveshaft mods because I need to lengthen my front driveshaft anyway to get a better angle. I was told that when I do this swap that I need to upgrade my transfer case input shaft to a 23 spline unit from a 21 spliner.
If the transmission is a r151 from a turbo setup, then a 23 spline input is needed. All g54/w56's are 21 spline. Also you can turn you stock crossmember around and move it towards the rear one set of holes. A small clearance may be needed where the front drive shaft is once turned around. But lines the things up pretty good.
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Old 07-18-2011, 10:32 AM   #6 (permalink)
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Originally Posted by 2manyprojects View Post
If the transmission is a r151 from a turbo setup, then a 23 spline input is needed. All g54/w56's are 21 spline. Also you can turn you stock crossmember around and move it towards the rear one set of holes. A small clearance may be needed where the front drive shaft is once turned around. But lines the things up pretty good.
Thanks for that link- it was very helpful. The five speed is either a W56-A or a W56-B. The first gear ratio appears to be the same as my 4 speed, so no gain there. So, the advantages are an overdrive, and lengthening my front driveshaft. I think its probably worth doing it.
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Old 01-30-2012, 08:55 PM   #7 (permalink)
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question

i had an L50 that i dropped off at a local trans shop. he gave me an estimate for a rebuild at 700-800 bucks. i have a 4 speed in my truck now. so im thinking its worth while just to get one from marlin. not too worried about moving the crossmember or the drivelines cause i think im going to do dual t-cases at the same time. its going behind an 87 22r (yes carburated 87)

heres my question. what transmission should i go with? both the L series 5 speeds ar the same gear ratios and all the w series are the same gear ratios.
what are the differences?

and will they all bolt onto my bell housing?
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