Red_Chili

Cannot picture how vented rotors specifically for an 85 could possibly fit in the stock 85 calipers. I think you are still confused and about to make a mistake.

The rotors on a mid 80's truck/4runner are very different from the FJ60 rotors and WILL NOT WORK.

It is very simple:
--86 FJ60 rotors. These are vented, and as all vented rotors would require, they need a wider 'mouth' caliper.
--86-95 minitruck/4Runner calipers. If you specify 4 cylinder motor, your work stops here (but your brakes will not be as powerful as they could be).
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If you specify v6 calipers, you have some more to do, but nothing earth shattering:
Marlin FJ80 master cylinder
Junkyard V6 booster as described in posts above.

It is that simple. Do all the above and enjoy a new world of braking.

CAPTDASH

Well after careful consideration, I am going to just get the Marlin package. When I order new wheels should I get wheels for a IFS V6 so the rotors don't hit. Is there anyway around using spacers?

Etype R

You can grind the calipers some, but I think you will need spacers. With 35" tires you need a wider stance anyways, to keep the tires from rubbing on the leaf springs.

CAPTDASH

I got 1450 38.5 Swampers on my 85 and they don't rub. I don't like using spacers as they weaken the stud strength. I may just use the 4 cylinder caliper. I just don't give a crap about having to modify parts to make them work. I just put some brand new 30 inch tall tires on this runner, so I don't think I will have an issue there. Will rims for a IFS front work better than wheels for a sfa?

Red_Chili

The term 'spacers' is often used like the generic 'Coke'. There are spacers, and there are adapters. Spacers can add stress to the lug studs but not if they are reasonable. Adapters don't - they bolt on, then present new lug studs to the wheel, often stronger than Toy stock. Adapters are fine and solve a lot of problems, simply.

I think you need to get out of the mindset of 'buying x part for y model & year of truck' (parts counterman thinking), and start thinking about specific backspacing in the case of wheels, or the usual proven upgrade path in the case of brakes. It will probably be less confusing. You are building something custom. Choose the backspacing you want, and adapters if needed to make it work, based on physical measuring.

Etype R

I believe if you grind the cooling fins off the v6 calipers, you can run them without spacers... But I have not done this my self, so I am not 100% sure on that. You can see how much ribbing there is. I run 1.5" spacers up front, to match the width of the IFS rear axle I swapped in.

CAPTDASH

Thanks Etype for the pic. Where is the best or most reasonable place to buy those Apaters from? Thanks

Etype R

I bought mine off ebay, they ended up being All-pro wheel spacers

All the Toyota vendors sell them as well, just buy them from who ever you feel comfortable with. I figured they are all the same, and Ebay was far cheaper since I needed 4 when I first installed them. Later I swapped a IFS rear axle and sold one set of them.

CAPTDASH

etype those spacers you have there look quite a bt thicker than required to clear the calipers. What thicknesses do the spacers come in? I would only want just enough spacer to clear the calipers. Thanks

Etype R

Mine are 1.5" spacers, to make the front axle match the rear IFS axle width. They sell them as short as 1/2" I believe, in the bolt on style. But like I said, you might be able to grind down the cooling fins and clear without any spacers. If it comes down to it, you can go to your local auto parts store and just by some 1/4" spacers. I am running 1/4" spacers on the back of my truck after doing my rear disc brake conversion.

I would say call Marlin, talk to their guys. They should know what you will need to do, to run them with minimal spacing

Red_Chili

AHEM... those are not spacers, those are adapters...
If you want just enough to clear the calipers and don't want to grind the calipers, it depends on your wheels. But IIRC you want 1/4" SPACERS.

For adapters, I would not go less than 1" because you want enough material for the stock lugs to hold the adapter, and for the adapter's lugs to seat properly in the adapter, and to have enough material to reliably hold the wheel.

Capische?

+1 on 1.5" adapters to match the IFS rear axle. Wider is good.

ccannon222

How do you get the larger 9 3/4" V6 Duel diaphragm brake booster to clear the steering column u-joint on 84 and 85 PU/4R? I’ve seen people use a BFH to put a large dent into the booster to make it clear. You could swap out your steering column with one from an IFS PU/4R. You could also put a spacer behind the booster and modify the shaft to the brake pedal but why do this when you can use a different brake booster that works the same and clears?

The 9 ¾” duel diaphragm brake booster fits 86 to 95 PU/4R because there is a smaller steering u-joint.