Bossman & Dan “The Man’s” Tips For Measuring The Exhaust On Peterbilt and Freightliner

Here is Bossman with Peterbilt 379 or 389 Gliders

When you are trying to figure out what exhaust kit you need to order for a Peterbilt 379 or 389 Glider you need to take a few measurements. Let’s say this truck is a 2004 and I am wanting to be 12 foot 6 inches in overall height.

You first need to measure from your lower cab bracket on the cab corner to the ground and figure out what that measurement is,  on this truck, it is 44 inches.

And we know we are going to go with a three-piece exhaust kit, so we are going to get an elbow, a center spool and a top stack.  Now Lincoln Chrome, BestFit, TPHD and most of your exhaust kits for Peterbilt are going to be the three phases with the exception of a very few brands. 

With that said we know we are at 44 inches here now we need to determine what spool we need.

Typically, on a 2003 and older 379s will have a 52-inch spool and 2005 and newer will have a 55 inch spool.  We find this by measuring from the lower cab bracket up to where it will mount to your top mounting bracket. 

All Peterbilt trucks will have a bracket somewhat similar to this one.

If your factory exhaust attaches to the lower webbing or the lower side of this bracket it is going to be a 52-inch spool.  If it attaches to the top of the webbing, the top of this bracket it is going to be a 55-inch spool.

Now knowing that we are going to take our 44 inches from the bracket to the ground and our 52-inch spool from our 150 total inches and are left with a need for a 54 inch top stack.

12.5 feet x 12 Inches per foot = 150 inches

150 inches – 44 Inches – 52 inches = 54 Inches

If you can look at your upper exhaust bracket and if it is close to the bottom of the webbing you will know it is a 52-inch spool and if it is close to the top of the webbing it is a 55-inch spool and we have found that to be true each and every time!

Now, this is only true for Peterbilt 379 and 389 Gliders so if you have a different truck please make sure to measure from the ground and from your factory mounting brackets to determine the best fit for your truck.

If you have further questions or have another make model you can always call one of our parts pros 877-458-9398 or chat with them on the web here.

Freightliner guys do not worry. Dan “The Man” has you covered!

Hey, there this is Dan The Man with 4 State Trucks. We had this Freightliner Classic in the shop here and we just poured the exhaust off of it along with a couple other things and we figured this would be a good opportunity to show you guys how to measure exhaust when you are trying to figure out how high you want to be.

Basically, these trucks it’s pretty simple this particular wanted to be about 13.2-foot overall length so we are going to measure from the center of the bottom clamp to the ground and try to get it on as level ground as you can to get an accurate measurement. From there we take that number and then add it to a hundred and fourteen options we have for a stack hit and that gets us right around thirteen point one six total height so just under where the customer wanted to be but we can’t get much closer than that.

So, First convert your total height into inches.

13.2 Feet *12 Inches Per Foot =158.4 Inches

158.4 Inches – 44 Inches = 114 Stack

If you have further questions or have another make model you can always call one of our parts pros 877-458-9398 or chat with them on the web here.