I've got an 84 toyota with 22r with a weber carb, and manual transmission, I'm wanting to regear. The truck is driven on highway to and from the beach, will 4.88 be to low or should I be going 4.56? Anyone running this combo that could give me some rpm numbers would be great
4.88 or 4.56 with 31's
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Mine is 4.56 just as it left the factory and runs 100km/h at ~3,000RPM and 110km/h at ~3,200 on 31s. - The OE Tyres were 28.9"
why even re-gear for 31's? if you had 33's I could see why. your truck should probably have 4.10's. 4.10's are more than enough to push 31's
I would stick with the 4.10. I ran them with 32" tires for years before finally regearing to 4.56 after installing 33" tires. I ran 4.88 in another truck with 33" tires and would not do that again.
My truck came stock with 4.56 31's and a stupid a340h tranny and it pushes those tires easily and has great low range. But if your driving the highway more just stick with the 4.10's. those will be plenty
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I have built several of these trucks over the years and generally run 4.10 with 31's, 4.56 with 33's and 4.88 with 35's. My current trucks (85 4runner 31's, 88 SAS 4runner 35's, 94 1Ton chevy axles 35's pick-up) are set up this way.
I am running 4.30 in my 90. 22re, 5spd running 265/75 (~32") and it suits me. They are factory diffs I got used. I originally swapped them whe I stepped up to 31's and was well please.
Generally the 4.56 came stock in the 22re/auto trucks, 4.88 were in the 2nd gen v6 auto 4runners.
If you want the 4.56, check around and see if you can find a factory diff that you can bolt in.
With 31's the 4.88 will make you want to get out and push on the highway. Top speed will probably be in the mid 60s, it would pull a house down, but will lose the top end. If you don't plan to go bigger than a 31/32 then I think you would be happy with the 4.56.
Generally the 4.56 came stock in the 22re/auto trucks, 4.88 were in the 2nd gen v6 auto 4runners.
If you want the 4.56, check around and see if you can find a factory diff that you can bolt in.
With 31's the 4.88 will make you want to get out and push on the highway. Top speed will probably be in the mid 60s, it would pull a house down, but will lose the top end. If you don't plan to go bigger than a 31/32 then I think you would be happy with the 4.56.
Interesting. I have 4.88's in my diffs, and I ran 33's (BFG ATs), I thought it was perfect. Speedo was dead on.
I agree, I ran 4.88s in a 91 PU with 33 BFG ATs and loved the way it
drove. Felt maybe SLIGHTLY lower than the stock gear/tire combo but not much.
Over-all had a great feel....
Before I re-geared and went 33, I ran 31's for years on stock gears (4.10) and had zero issues.
Even drove it to the west coast a few times that way.....
I think 4.88 and 31s would be too low, depends how much crawling vs HWY you're doing I guess
What gears are you running now & how will you use your truck? My '81 with an '85 engine/tranny/xfer, Weber carb, 32" tires & 4.56 gears does well off road. Does OK on road, 'cept sluggish on hills. I need to keep it floored in 5th to maintain speed usually. If I can keep rpm's above 2500 it will maintain speed. I try and keep between 2500 & 3000 on highway and if it starts dropping below that - downshift is eminent. I'm at work now & going off memory on the rpm's, but the numbers sound close IIRC. Hope this helps!
Edit: On a errand tonight, I checked and at 2500 rpm in 5th I'm doing 58 mph.
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4.56 will put you back to "factory" ratio so to speak with 31" tires but I don't think I would regear just for that. I installed two TRD elockers and went 4.56 but they can be bought new with that ratio.