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| dounan p. morton (Dounan04)
Registered Member Username: Dounan04 Post Number: 8 Registered: 11-2004 Posted From: 24.34.39.213 Rating: N/A |
does anyone know of 1 for sale on the east coast? thanks | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| john w. roan (Chessie4905)
Registered Member Username: Chessie4905 Post Number: 583 Registered: 10-2003 Posted From: 71.58.117.21 Rating: N/A |
Dean's Coach Durham NC; Luke's in New Berlin NewJersey | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| dounan p. morton (Dounan04)
Registered Member Username: Dounan04 Post Number: 9 Registered: 11-2004 Posted From: 24.34.39.213 Rating: N/A |
thanks , would you happen to know if there is any other trans. that will bolt up to and work in a stock 04. i searched the archives and found nothing. i'm looking for just a little more than direct drive. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| James Stacy (Jimstacy)
Registered Member Username: Jimstacy Post Number: 54 Registered: 1-2001 Posted From: 75.41.2.152 Rating: N/A |
IIRC the 4th gear ratio in the stock 4104 Spicer is an overdrive; taller gear even than the V730 overdrive ratio. The stock rear axle ratio is 4.10 (or 4.11 depending on mfg). Only other stock gear that will fit is the 4905 stock ratio of 4 3/8th. Seems you already have the tallest stock gearing I know of. I believe even the Hydroshift option gave a lower ratio in each gear position rather than a taller one. Someone that's intelligent might correct here me as I'm going from memory. (A very old memory). How about taller tires? Jim Stacy | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| RJ Long (Rjlong)
Registered Member Username: Rjlong Post Number: 1249 Registered: 12-2000 Posted From: 67.181.189.94 Rating: N/A |
Dounan - Why do you need a new engine cradle? There is no other manual gearbox that will work with the stock powertrain in the 4104. This has been hashed over numerous times on this and other busnut bulletin boards. The same goes for an automatic - you have your choice of the older two-speed VS2 or the newer three-speed V-730. Either way, you need to change to a 4106 or later rear axle to accomodate the different driveshaft offset. A 6V92TA / V-730 / 4106 rear axle has been a common and successful powertrain swap in the 4104s. Jim - For your (and other busnut's) information, here are the transmission ratio tables for the GMC Parlor Coaches:
I just picked up on something here. . . for a long time, lots of busnuts have complained about the rather tall first gear in our coaches. I've always just looked at the 4104 and 4106 charts, never really paying any attention to the 40-foot 4905's gearbox. But look closely - first gear is actually LOWER than that of the others! Hmmmm. . . I might just start looking for one of those!! Sorry, they don't fit the 4104s, sadly. FWIW & HTH. . .  | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| dounan p. morton (Dounan04)
Registered Member Username: Dounan04 Post Number: 10 Registered: 11-2004 Posted From: 24.34.39.213 Rating: N/A |
rj, i want another cradle because i have access to just about enough part to put together a turbo-6-71. so i would like to put together a whole cradle package to hold in reserve. For next time mine gives me any trouble, or when i get bored, whichever comes first. thanks all for the info dounan | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| dounan p. morton (Dounan04)
Registered Member Username: Dounan04 Post Number: 11 Registered: 11-2004 Posted From: 24.34.39.213 Rating: N/A |
what exactly is the hydrashift unit i've read about? is it a trans or something between the engine and trans ? does it reside in a stock bell housing? are they unattainable? what is the final drive ratio? is it more than 1 to 1 ? | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Jack Campbell (Blue_goose)
Registered Member Username: Blue_goose Post Number: 7 Registered: 5-2007 Posted From: 71.101.55.168 Rating: N/A |
The hydroshift is a compleat transmission. They are hard to find. You have all the gears that you need if you have one. One of my good friends used one and worked on the also. He has gone on to better places now and I have no idea where you could find one. Some of the oldtimers should know where to find one. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| James Stacy (Jimstacy)
Registered Member Username: Jimstacy Post Number: 55 Registered: 1-2001 Posted From: 75.40.234.158 Rating: N/A |
RJ, thanks for the ratio info. Thats what happens when relying on memory (which my wife said was the second thing to go. I don't remember the first). The Hydroshift was a rare factory option. It consisted of a planetary gearset and two clutches all mounted in the original bellhousing. Without my maintenance book to verify, I believe it gave a lower gear ratio available in each gear. It acted like a splitter box giving 8 possible forward gears. I'll have to check "Da Book" to verify gearing. I know it is in my 4104 maintenance manual in the rear section on options. It turned out to be a fragile design according to Garry Dean and most were removed from service because of downtime. Very unusual to find one today. FWIW Jim Stacy | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| john w. roan (Chessie4905)
Registered Member Username: Chessie4905 Post Number: 585 Registered: 10-2003 Posted From: 71.58.117.21 Rating: N/A |
We used to have one years ago...it gave an overdrive in each gear of about 25 to 30 percent. Worked good with 4:11, perfect with 4;56. I'll bet that the parts are from the VS series automatics except for a few items. Good Luck finding one. The best deal would be for someone to make a compact unit that would go behind trans. Since the drive shaft is about 4ft. long, there is room.The 4104 parts book lists a 3 7/8 ratio, but I've never seen it. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| James Stacy (Jimstacy)
Registered Member Username: Jimstacy Post Number: 56 Registered: 1-2001 Posted From: 75.40.233.32 Rating: N/A |
True on the 3 7/8 ratio. I was never able to find one even with Dean's Coach doing the change. BTW the 4104 rear axle works fine with the newer final drive units, at least with a V730. We installed an RTS cradle with the 6V92TA aboard so we were able to control the right to left positioning. (6V is much shorter overall than the inline 6). As a matter of fact, when we were done we discovered we could have easily put in an 8V92. Put it in maybe, kept it cool, probably not. It's worked fine for nearly 100,000 miles. The 4 1/8 (4.125) ratios varied slightly depending on supplier. I counted teeth on several samples. One I remember was 41/10 (4.10) and another was 37/9 (4.11). Not enough to be noticeable but just for interest. Jim Stacy |