BCM Community

Hey guys,

My brother-in-law has an 01 Eagle and wants to go to 336 gears. Does anyone know what kind of rear end is in there and what standard gears would be?

Thanks,

Richard

Richard, it is a Rockwell with 3.73 gear the housing will accept up to 3.33 gear.
The 01 is just a truck rear flipped over.
If he has a 8v71 with a manual 4 speed a 3.36 would be a poor choice for him but if he has a 740 auto they make a wicked 3rd gear with the 3.33,3.36 and 3.38 rear gear.   good luck

Clifford, In my manual it says Ratio 37/10, what does that mean? It does not mention anything like you posted. It also says "All up to #7443". I'm assuming all 01's and ending with ours #7443.

I'm going to write the information in my manual since it seems to be what is needed.

Sorry for the hijack Richard.

Paul

Thanks Clifford,

He has a 8v71 with turbo and a 5 speed auto. He's trying to lower his rpm and help his milage. I'll check around San Antonio tomorrow and see what I can find.

Thanks Again,

Richard

If its Rockwell, maybe it's a SQHD. The year is about right. The most popular truck diff for 20 years. If it is, they are pretty easy to find although it may take some looking to find that ratio. Rebuilt/exchange though its only around $800.

37 teeth on the ring gear and 10 on the pinion gives you the ratio. (3.70)

Paul, 37/10 is a 3.70 ratio if you count it it will be a 3.73    


good luck

Hi Paul,

Come on in anytime. I think that means you have 3.70 gears.

Richard

Hi Richard,

Yip, now it all makes sense. That is one area I don't have much knowledge on and this helps.

Paul

OK Clifford,

Which would be the best ratio?

Richard

Richard,

I have 3:36 gears on my 10, but attached to a Voith 4 speed auto.  At 70mph I turn 1950rpms.  At 80 I turn 2100rpms.  I like the the setup, but tough to get rolling if there is a hole the tire is in or steep hills.  I'm just down the road from you in Pleasanton.

David

Richard, if you find the 3.36 go for it makes a good combo with the Allison and with his 8v71T it will handle it ok a 3.38 will work good also.
The 3.33 gear are about impossible to find.
If someone wants to sale you one from a 05,10 ,15 or 20 don't buy it will not work.
To answer your  question the 3.36 would be my choice but I would love to have a 3.33 for my 05 




good luck

So smart guys, which model Rockwell rear end/housing is in an Eagle? SQHD is a tandem set-up.

I never said it was a SQHD but try this and see if it helps you R162  


Good Luck

can anyone tell me where to find a speed calculator?

Richard

Think Crown used the rear SQHD for a single drive unit. Know they used SQHD's in the tandem buses. Doubt you would be that lucky though. Likely has the heavier unit used on single axle trucks from the 50's and 60's. Think that was the R 180. Not all housings are the same either. You should check with a gear shop and see what they can build for you because I don't like your chances of finding a used drop in with a gear that high.

Richard, tell your brother in law to ask on the Eagles board one will pop up George just installed a 3:36 in his 01 they are easier to find for a 01 than the other models of Eagles with the drop box.
I am checking on a ring gear and pinion for you I know a Eagle owner that had 2 sets of 3;36 ratios for the 01 and I will PM you Friday



good luck

Speed calculators:

http://www.thebouthilliers.com/4106/calcmph.html (http://www.thebouthilliers.com/4106/calcmph.html)

http://www.cwis.net/~mallie/page12.html (http://www.cwis.net/~mallie/page12.html)

happy coaching!
buswarrior

Thanks Buswarrior !!!

Hey guys, someone brought to my attention that I might have offended folks here...sorry, did not mean that in any way.

Clifford, it was NJT that mentioned SQHD...that's why I brought that up.

As I shared with the individual who brought the offense to my attention, I am looking more at the specifics here, wanting to know which things from the heavy duty truck industry (which I am involved in) will work or apply to buses (which I am not currently involved in) as I hope to become involved in buses at some future date.

I do appreciate the knowledge shared here, I believe that is what this forum is all about. There are some things that I know a lot about, but buses are not one of them...thanks for all you regulars who share your years with us. I too am glad to share the knowledge that I have learned in 20 plus years of trucking and trailer repair with any who ask.

Hopefully when I said 'all you smart guys', that was not a derogatory statement, rather an invitation to those who know what model rearend it actually is...is that clear? The thoughts go through my head but sometimes they don't get worded correctly.

I have an R-170, and an Eaton RS23-180 so it would be helpful to know if those are used in buses.

If anyone has an issue with my posts, please feel free to let me know!

Thanks, and I do appreciate the information here.

Dave G

When I changed gearing in my 01 a 3:36 was the largest piece that would fit into the housing -per rockwell.