Rear wheel cylinder upgrade?

[RColston]

It seems that I had read a previous post regarding upgrading 2500 rear wheel cylinders to the larger 3500 ones. I am getting close to a rear brake job and would like to make that upgrade. If any one has info. regarding that post or the P/N's of the cyl's a little help would sure be appreciated. (boy are my eyes tired from reading prev. posts trying to find this)

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1996,2500,CC,SLT,Driftwoodx2,2wd,5spd. ,3. 54,K&N,AirRide,Reese20k,1996 Hitchhiker,36RK 2slide pretty stock, but lookin' for more!

 

[Timinator]

I believe the post is called "Brake Salvation. " Do a search for that.

 

[HEMI®Dart]

Here is the original thread. I was one of the guys that did this swap. Braking is greatly improved. #ad

https://www.turbodieselregister.com/ubb//Forum3/HTML/000696.html

 

[RColston]

Tim,

THATS THE ONE #ad
!!!

Thanks Much.

Rick.

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1996,2500,CC,SLT,Driftwoodx2,2wd,5spd. ,3. 54,K&N,AirRide,Reese20k,1996 Hitchhiker,36RK 2slide pretty stock, but lookin' for more!

 

[RColston]

Tim,

THATS THE ONE #ad
!!!

Thanks Much.

Rick.

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1996,2500,CC,SLT,Driftwoodx2,2wd,5spd. ,3. 54,K&N,AirRide,Reese20k,1996 Hitchhiker,36RK 2slide pretty stock, but lookin' for more!

 

[Wiredawg]

Do y'all know if the 2000 2500 w/ Dana 80 has the same rear wheel cylinders as the 3500. I saw in the referenced thread where someone thought they were, but no confirmation.

Wiredawg

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2000 4X4 SLT QC 8' bed; 6 spd, 3. 54 ; BD exhaust brake and 4" exhaust syst; TST PM2; Airlift Super Duty rear air bags; RS 9000 shocks; pyro/boost gauges in 2 gauge a-pillar mount; back preasure gauge mounted under dash; KN air filter; Brown's Welding brush/grill guard, rear bumper & headache rack; nerf bars and aluminum roll top rear cover, Warn front receiver and Hadley air horns, 20K Reese hitch.

 

[HEMI®Dart]

Wiredog, Your truck has the 3500 wheel cylinders. Its the 94-97 2500 trucks that have the smaller ones.

 

[TowPro]

I have a 98 2500, when I check Carparts.com, they list a 2500, and a 3500 part number. I have the Dana 80 rear, do I have the big cyliners or not? Hate to do the job and find I already had the big ones.

Originally posted by HEMI®Dart:
Wiredog, Your truck has the 3500 wheel cylinders. Its the 94-97 2500 trucks that have the smaller ones.

 

[LSMITH]

Help me out here, shouldn't you also change the proportioning valve? Any time you change the size of the cylinder it will change the braking force that axle can make. I would hate to have rear wheel lockup sooner than usual. Is there something that I am not aware of here?

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99 2500 QC 4X4 AUTO SB 24V LARAMIE SLT 3. 5 LSD 285-75-16'S Everything but leather NRA Member

 

[HEMI®Dart]

I'm confused now. See the chart below. Scoll 1/2 way down to the 94-99 HD. See wheel cylinder bore:

http://www.ecpe.vt.edu/~dfritz/technical/BRAKES/specs.htm

There must be an error on this chart. It says the 94-97 2500 trucks got the BIG 27mm wheel cylinders, while the 97-99 got the SMALL 23. 8mm cylinders. ? I think this is reversed? Note the 2500 & 3500 trucks both use a 27mm wheel cylinder.

It also does not say what rear end (dana 70 or 80) for the 2500 series trucks. This could matter which wheel cylinder it gets.

Here is the original TSB on the swap: http://www.ecpe. vt. edu/~dfritz/technical/TSB97/05_04_97. HTM

LSMITH,
The original TSB says nothing about a proportioning valve change when going to the 27mm wheel cylinders. I didn't change mine, and they are fine. Don't lockup prematurely. #ad


Wiredog,
It looks like the '2000 2500 & 3500 use the same wheel cylinder.
Its smaller than previous years. Go figure.




[This message has been edited by HEMI®Dart (edited 01-21-2001). ]

 

[sam peterson]

Stock specs for wheel cylinder size is easy to remember===13x2 1/2 uses cylinder size 1 1/16----13x3 1/2 uses cyl size 1 1/8. The upgrade to the larger cylinder won't be any problem unless the rear tires don't grip well in the rain. At higher speeds the antilock should keep the tires from sliding. If a different prop valve was used the larger cylinder would be of no advantage. The idea is to increase rear brake pressure.

 

[HEMI®Dart]

Sam,
Do the 97-99 Dodge Rams 2500 come with the 27mm wheel cylinders (1 ton) from the factory?

The chart says they Don't. But it says the 94-97 trucks DO have the 1 ton 27mm cylinders from the factory. Its got to be an error.

The chart is giving us 2 different wheel cylinder sizes for the 2500 series trucks (23. 8mm & 27mm OEM)with a 13 x 2. 5" shoe depending on model year. See what I mean?



[This message has been edited by HEMI®Dart (edited 01-21-2001). ]

 

[BFaoro]

So what is the verdict ? #ad
My truck is a 96 2500 with the Dana 80. is it the 27mm ? I am going to put new brakes on soon and it would be a good thing to know before I buy the parts ! #ad


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96 2500 4X4, SC,SLT, 12 valve,lost kitty 5SP 3. 54. line-x liner All stock (for now)

 

[HEMI®Dart]

Rockymtn,

Its safe to say your truck has the smaller 23. 8 mm wheel cylinders.

To upgrade to the 1 ton 27mm Wheel cylinders its Mopar p/n # 4761603. Same # for both sides. They are a direct swap. Check the thread "Brake Salavtion" for more info. Link is above.

Its the 98-99 2500 trucks that are in question as to what OE size wheel cylinders they came with. They Should have the 27mm's as OE. #ad




[This message has been edited by HEMI®Dart (edited 01-22-2001). ]

 

[sam peterson]

All of the 96 & 97 2500,s that we have had in our shop have had the smaller sized cylinders from the factory. We automatically upgrade all to the 3500 size which ia 1 1/8.
Sam

 

[HEMI®Dart]

Thanks Sam. Thats the question we have been trying to answer.

So the 98-99 2500 trucks should have the 1 1/8" (1 ton) wheel cylinders as OE.

Why is Tow Pro getting 2 different part #'s for a '98 2500 & 3500 wheel cylinder?

A quote from the "Brake Salvation" thread:

'I just got off the phone with Mopar4Less and they tell me that the 99 2500 has the same brake cylinder as the 3500 (pn 4761603)'


Lets put this **** topic to rest #ad





[This message has been edited by HEMI®Dart (edited 01-24-2001). ]

 

[sam peterson]

Hey guys, Before we put this topic to rest i would like to mention that the rear brake system on the 2nd generation Dodges is the same as GM has been using for several years---early 80,s or before--On the 3500 series GM truck the rear cylinder size was 1 3/16, that is for the 13x3 1/2 shoe size. For the best rear braking power this is the cylinder to use if your trucks are loaded with additional weight on the rear axle, such as towing etc. You can buy these cylinders at most parts stores, just specify GM. Sounds terrible doesn,t it. Any questions just let me know. Sam

 

[jsimpson]

OK; what about 1st gen one tons?

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http://coffeewithJesus. homestead.com/web1.html 89 1-ton, Amsoil System 3000 5-30,K&N air filter, cleaned-up exhaust, Dynomax straight-thru, rebuilt pump, thermostatically controlled twin 14" Permacool electric fans, intercooler), modified 518 OD transmission, Gear vendors OD controler, R-134 refrigernt, louvered front fenders, 93 aftermarket smoothie grille, new Dupont Chromacolor black, black-and-red rubber rubstrip, black headlights, powdercoated bumpers; 78 35'Avion, 93 Lance 900 slide in with generator and power jacks. To see my truck, Click on: <A HREF="http://albums.photopoint.com/j/AlbumIndex?u=1169022&a=10097213

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[sam peterson]

First generation trucks had 12 inch brakes, same as Ford. 3/4 tons had 2 1/2 or 3 inch wide shoes and 1 tons had 3 in. wide. A wide variety of cylinders are availabe for this brake system. The range is from 15/16 to 1 3/16, depending on how heavy the truck is. Some rear brake lockup can occur if it has to much braking on rear during lighter loads. Usually this system doesn,t need to have frequent adjustments like the 2nd gen. trucks. We usually install 1 1/8 cylinders on the 1 tons with a carbon met shoe. This gives good stopping power & long life with no wear on the drums. This helps the front brakes work better because of less heat buildup during hard stops. Pads last longer.
Sam

 

[C Schomer]

I checked mine today, they're 15/16". This is a great thread! I've been telling my wife - "now that the truck goes like hell, I need to work on the brakes next"! Now I know what to do! Craig

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97 3/4Ton, 2WD, 5SP, #11 Plate, AFC kit, 14 Housing, AF942M Air filter, Gutted Cat, 4"From Turbo, Airlift, Shortened Frame, Custom Bed, HEY FORDBOY POWERSTROKE THIS!