| Author | Message | ||
| Kevin Black (Kblackav8or)
Rating: |
Rockwell axles. Apparently the SLHD is a pretty old axle. I see many references when searching that they are listed along with parts for SQHD's. Are the ring and pinion sets the same? What about carriers? Nearest I can tell they are but the axle shafts themselves are a different size. If true then from one site it said if you changed the side gears?? then refer to the SQHD. Am I right? The bus I am looking at has 4.11's at the moment and tops out at a little over 70. I would rather turn over a little slower in OD and have something like 3.55's in the rear. Said vehicle has a 13 speed and a 855 cummins. Hill climbing with those gears still won't be a problem. Just leaves a little extra for passing or turning slower at cruising speeds. Experts? Are my assumptions correct? | ||
| Sammy (Sammy)
Rating: N/A |
Did you check Meritor's website? I don't have the answer you're looking for, but maybe there would be some detailed info on the ring and pinion sets.Best of luck with your swap. | ||
| JimH Rating: N/A |
I changed gears on my 01 Eagle a couple of years back. Don't recall what the axle numbers was but the 01 is a 1963 -- is yours older? Went from a 3;73 TO A 3:36 - WAS not CHEAP - AFTER EVERYTHING DONE - COMPLETE REBUILD - $4400. Have a good 3:73 set on hand if anyone needs tem. JimH | ||
| David Hartley (Drdave)
Rating: N/A |
Change your tire size to a larger diameter. With the 855 you don't have a lot of horsepower and torque to start with and dropping the ratio will probably just be an expensive patch. Besides who needs to be in a rush anyway??? My MC9 runs 75 on the flats but I drive 65 normally, No sense in killing the coach for a few more miles per hour. I have hit 80 with a tail wind and downhill.. <grin>.... | ||
| Kevin Black (Kblackav8or)
Rating: N/A |
It already has 11x24.5 tires on it. 13 speed OD with a BCIII/IV 400. If I buy it, I would rather only turn it 1800 at the typical I-5 / I-10 speeds I see and have a little reserve for those rare passes. Not saying I will be cruising around at 90. 70 is just fine but you occasionaly need a tad extra in the bank. The question remains, SLHD and SQHD? Do they run the same ring and pinion sets? | ||
| tommy thornton Rating: N/A |
ring gear and pinion are the same! only difference is the axle gears/side gears.SQHD is 38000lb and a SLHD is 34000lb,axle housings,axles,hubs,wheel bearings,etc are different,3rd members are the same except axle gears/side gears. TommyT | ||
| john w. roan (Chessie4905)
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You could also change the trans over to a double overdrive.RTOO9513 or11513, or whatever model Roadranger you have. | ||
| Henry R. Bergman, Jr. (Henryofcj)
Rating: N/A |
Kevin....now you gots me curious and curiouser. What kind of coach do you have that has a Big Cam 400 with a 13 speed???? The world wonders. It's not a Crown is it?? You MAY routinely and safely "lug" or "pull down your mighty Big Cam 400 to as low as 1400 with FULL THROTTLE and perhaps a little bit lower under part throttle. It all depends upon what power and torque springs you have in your injection pump and how the engine was "set up" when rebuilt. A good example would be my Big Cam 250.... ...in my '74 Crown 10-wheeler. It "seems" or "feels" like it pulls the strongest at only 1600 rpm...then the power kinda flattens out to around 2100 which is all the faster the mill will rev.... ....on the straight and level with no wind. Yeah...others were maybe correct when they suggested just swapping out the RTO 9513 Roadranger (if that is what you have) or maybe... .....the RTO 12513 to a RT00 model which will increase your road speed by about 17% or soosss. Fuller even has the rare RTOOO series if you really want to go fast. Of course, driveshaft speed/balance becomes a concern eventually. My Crown has 3.90's, a RTO 910, 12R X 22.5 tires and goes right at 80 at 2100. I can "light cruise" as low as 1400 at 55 mph in 10th. Good luck and tell us all YOU HAVE A CROWN??? (maybe?) | ||
| Kevin Black (Kblackav8or)
Rating: N/A |
I don't have it yet. I have to wait for the war department to give me permission to buy it. It is a Crown. It does have a RTO-913 in it. The drivetrain was swapped out around 80 or so when it was converted to a MH. I wonder if I can find a pair of pumpkins out of another Crown for less then doing the gear swap. Seems like lots of them are being crushed at the moment. I also understand you can have the transmission rebuilt to just about any spec if you can afford the parts. A later one wouldn't be a bad upgrade. A 900 lb foot capable transmission is probably just barely up to the task. The only thing that saves it is probably a light foot and a fairly light vehicle. An 80k truck with that engine would probably tear it up. Kevin | ||
| john w. roan (Chessie4905)
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Not that bad to change trans...I did it once with a former Roadway tractor with a 6v92. Was going to use it in my Brill, but got away from it too long. Never got it installed. RTOO913 or 9513 will end up with 3 overdrive ratios, which will give a nice gear for any situation. Tractor had 4:11's and when shifted into 13th, it would really roll, even with a 1900 governed speed. I changed about 6 gears in the main section to do it....some say that you can get away with just swapping a couple of gears around inside, but the trans might be noisier.Easiest would be to get an rto909 or a rto9509 trans and bolt the OD rear section off your present one.Should be able to find a good used one reasonable at a truck salvage place, or a trucking company that keeps a lot of used parts around. | ||
| Kevin Black (Kblackav8or)
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Paging Henry R. I tried e-mailing you directly. I am interested in what you did to yours. Kevin | ||
| Henry R. Bergman, Jr. (Henryofcj)
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Kevin. I did nothing to my '74 Crown 10-wheeler (VIN 37371) It apparently came that way from the Crown factory. Very tall gears, particularily with only a 250 Big Cam Cummins. I UNDERSTAND (I think) that Cummins also had/has a do-hickie called a "duel power valve" that is hooked up to a circuit (air or wire?) that limits the throttle play in the "low" side of... ....a Roadranger, thus saving the low low gears from the mighty full torque of a mighty Big Cam 400. Then when your range shift and row thru the same gears again, the mill then goes balls to.... ....the walls. I was told the 900 series of Roadrangers can actually handle 1800 pounds of torque in the upper high side gears. It depends upon the gear ratios and torque multiplication. Anyway..the mind boggles. Well, my feeble mind anyway. Wonder how the convertor of your Crown's mill/tranny figured out the intercooler plumbing. Sorry my E-mail failed. My fault. I havent't been checking my E-mail on a timely basis. Yeah...might be just $cheaper$ to buy a good RTO-9509 (or RTX 9509) like Gary Sadler has and steal the back section and exchange it with ... ....your RTO 9510 (if that is what you have) rear section. That will give you a RTOOO 9513 with 3 overdrives about 17% to 18% apart. You might have to rebalance the driveshaft. Very fast. CROWNS FOREVER Henry of CJ henryofcj@hotmail.com | ||
| Kevin Black (Kblackav8or)
Rating: N/A |
Sounds cool. This one has a RTO-913. I still have to actually buy the bus. Sounds like if folks are scrapping all sorts of crowns, a set of pumpkins wouldn't be that expensive either. A tripple OD sounds pretty cool. |
