turfguy

finally got the other side done, & after endless bleeding, got my brakes duialed in on my 94-HOLY CRAP!!!
I practically don't need trailer brakes now lol , & if I stab it quick enough I can lock up the back wheels & scare someone who needs it

blackimpala

I did the upgrade about three years ago and have been happy with it.

Floyd

funcruise

Just have to watch it when hauling heavy loads. With the extra pressure on drums its not hard to heat them up too much warp them

five20too

Is there a certain wheel cylinder to get? I am pretty sure they have different sized bores.

infidel

Napa part number 37337

astevenson

Thanks for the part #. I have been thinking of making the swap. Saw it in trucks TV on spike but was not sure which wheel cylinders to get. Now I just need to get some good emergancy brake cables to install at the same time. I installed oreilly cables about 3 years ago and now they are frozen solid.

beavertail

The ones at NAPA are made in China. Do you know of any that mightbe made somewhere else. I try not to use Cheapo China parts for important things. Also the cylinders on my truck look to be about the same size. I bought it about 3 years ago from a guy that towed a 32' fifth wheel. Is is it possible that he did this? Has this "swap" been around for a while?

infidel

I introduced the brake mod to DTR in my very first post in Dec 2003.
I'm pretty sure it was my invention but some people were using 3500 cylinders on pre '97 2500s for quite some time.
The 3500 cylinders aren't as big as the Napa 37337 though.
The 37337 increases rear braking force 23% more than the stock 3500 cylinders.
On a pre '97 2500 the rear braking is increased by 52%

torquefan

I was actually showed that trick by a Dodge engineer back in around 1995, and I was surprised to then hear about it on here after.

Incidentally, the 94-98 2500 cylinders have a 24 mm bore diameter, the 3500 cylinders have a 27 mm bore, and the GM cylinders have a 30 mm bore.

DieselDaze

Its about time for brakes on my truck as well - both front and back.

I dont do much heavy hauling and use the truck as my primary daily driver to and from work.
Whats the long term effects of running these cylinders on the back?

As previous mentioned in this thread, I assume these cylinders throw off any rear ABS?
On the few occasions I do haul a flatbed trailer with my tractors on the back, is there any issues with heating/cracking the drums with these cylinders?

Just curious.
Rich

b4black

When I bought a pair from NAPA, one was made in China, the other in Italy. There were a little different looking. I took them back and got a matched set.

infidel

I've been running the 37337s for over ten years no problem.
Both my trucks are 4 wheel ABS.
No problems on the several dozen other trucks I've installed them on.
Cylinders have been Chinese or Italian, no problems with either. All have been from Napa which seems to sell higher quality parts than other stores.
There have been a couple of people here who have had trouble with the larger cylinders locking up but it seems to be related to some unknown cause other than the cylinders.

Robert Rausch

In 2003 I put new rear-wheel cylinders on my '95. I got a pair of Chinese cylinders at a local, old-time, full-service auto parts store and put them in. They cost $9 each. While installing the first one it broke like a soda cracker--it just cracked in two. I was horrified. And in examining the edges of the break, it looked like a very fresh break--it didn't look old at all. I took them back and got USA-made ones for about $35 each. I didn't know about the 37337 upgrade at that time, but the USA cylinders have give very good service--they were stouter than the Chinese crap.

atc250r

I put my NAPA 37337's on about 3 years ago. This week I replaced the brake lines to the wheel cylinders and when I went to bleed them, both bleeders on the cylinders were rusted solid. I hit them with some heat but that just made the bleeders brittle and now both of them are snapped off. I see no point in using the lifetime warranty NAPA gives you, I don't need another pair of crap wheel cylinders. I'm going to look around for either some that aren't Chinese.

John

Robert Rausch

John, we can only hope that the same guys who are making the wheel cylinders in China are also building their submarines and ships!!