1980 Toyota

[donburks]

Just bought a 1980 4X4.  Found out it had a cracked transmission case.  Previous owner had coated the whole trans in aluminum colored silicon sealant to hide it.  lasted about two weeks before it started pouring out the gear oil.

I bought a 5 spd to replace the cracked 4 spd.  Complete setup with transfer and driveshafts.  I want to try the dual transfer setup.  I am not a super heavy duty rockcrawler

1.  Should I keep the stock 2.28 in both transfers or add the 4.70 to the rear one? 

2.  Since the 5 spd transmission is 5 in longer than the 4 spd and the additional length of the dual cases, will I have to move crossmember mounts back since the transmission length difference to use Marlins dual cases crossmember?

3.  When I have driveshafts lengths changed, should I use the front CV from the donor unit on the rear driveshaft and if I do will it go on transfer side of driveshaft?

4.  I have had 2 FJ40's, 1 FJ60, 1 FJ80, 2 4runners, and 3 pickups.  Other than lifting the FJ80, I have allways kept them stock so modifications are new to me.  Please help with concerns, commnents, and best bang for the buck.  This truck also will be used on icy days when I cannot ride motorcycle.

[yoshaleng]

having a 4.7 in rear t-case is definately a major plus....if you're on a tight budget, dual stock cases will be plenty slow for now if you're not out crawling every chance you get.
Once dual case setup is done you're going to need a new driveline...get one off a 2nd gen runner, it'll be the right length. That's a buddy of mine used for his 81 after dusl cases w/ Marlin adaptor.
if you must have one built, use the CV....more durable.

[junya92toy]

Sorry man it just seems some people here forget to put on their big girl panties and get pissy overy stupid things. So you get  a chance to drain the diff yet?

[1980yota]

1. It would be fine to keep the stock gears for now, double low is fine for 90% of the stuff I do. You can always add the gears to the rear case later.

2. You will have to move the crossmember back on the frame in order to accomodate the additional length. I put a w56 and duals in my 80 and used u bolts over the frame rails with a TG crossmember. Has worked great so far.

3. Some do use the front CV on the rear shaft and if so yes it would go on the transmission side not the diff side. I just had my stock shaft shortened in the rear with single joints at each end and they have also done just fine. No vibrations at all in 2wd.

4. A square front driveshaft is usually the cheapest way to go. Search on here and on pirate to find all the info you need. For the front shaft you will want to use ifs single joints or if you want to use a double joint use one from a solid axle 79-85. You dont necesarilly need to buy the spedo cable extension although it might be easier to do so. I am cheap so I rerouted my stock cable down the center of the trans just to the passenger side of the shifters (there are stock straps for this on the bottom of the floor) and it barely fits. I would also recommend getting marlins ball and seat for the trans shifter while you have it apart.

[83 Crawler]

1. It would be fine to keep the stock gears for now, double low is fine for 90% of the stuff I do. You can always add the gears to the rear case later.

2. You will have to move the crossmember back on the frame in order to accomodate the additional length. I put a w56 and duals in my 80 and used u bolts over the frame rails with a TG crossmember. Has worked great so far.

3. Some do use the front CV on the rear shaft and if so yes it would go on the transmission side not the diff side. I just had my stock shaft shortened in the rear with single joints at each end and they have also done just fine. No vibrations at all in 2wd.

4. A square front driveshaft is usually the cheapest way to go. Search on here and on pirate to find all the info you need. For the front shaft you will want to use ifs single joints or if you want to use a double joint use one from a solid axle 79-85. You dont necesarilly need to buy the spedo cable extension although it might be easier to do so. I am cheap so I rerouted my stock cable down the center of the trans just to the passenger side of the shifters (there are stock straps for this on the bottom of the floor) and it barely fits. I would also recommend getting marlins ball and seat for the trans shifter while you have it apart.

you could get the l52 5 speed out of a 83 there the same length as the 4 speed that will make it easeyer i think..

[1980yota]

you could get the l52 5 speed out of a 83 there the same length as the 4 speed that will make it easeyer i think..

This is true depending on which 5 speed he has. In this case you could probably reuse the factory mounting bolts and holes with a trail gear/marlin/budbuilt style crossmember. I went ahead and did the w56 because I got a good deal and they are suppose to be stronger.

[83 Crawler]

ya iv had no problem with my l52 the thing is a tank lol and there cheaper when i bought my 83 the people before me put in a g56 and had some haggard mounting so i went back to stock and have no problems   

[Jokeass-Wheelers]

my buddy in his 79 blew his 4 speed in his yota and put a 83 tranny in it and just used a 82 4x4 pickup yota rear driveline it worked