Has anyone ever tried making another top gear for their four-speed transmission so that it's a little less "busy" at highway speeds? I've seen this done for BMW motorcycles but wondered if anyone has tried it in the cruiser community.
Transmission Regearing
- Thread starter Doug_S
- Start date
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.
expensive proposition....one-off gearsets are never cheap, and getting a crew of 20 together to knock down the initial price would be difficult.
Cheapest bet is to remove your 4.1 stockers from the diffs and swap in a set of 3.73's.
Other cheapest is a H55F Toyota 5-speed, gain the OD....few writeups on that in the tech section.
Cheapest bet is to remove your 4.1 stockers from the diffs and swap in a set of 3.73's.
Other cheapest is a H55F Toyota 5-speed, gain the OD....few writeups on that in the tech section.
TxCruzr
Wait, this ain't Texas...
- Joined
- Sep 14, 2003
- Threads
- 18
- Messages
- 241
- Location
- Sierra Vista, Arizonahhhh
- Website
- www.webphotos.com
My plan to drop my rpms includes either swapping in a d300 or atlas and going from 4.11s to 3.73s like Woody said. Oh, and a set of 37s when someone feels like donating to the cause. 
Joseph
Joseph
- Thread starter
- #4
Ahhh I didn't mention that I could make the gears in my machine shop. I see that $OR gets about $1300 for a low-range gearset for transfer cases (WOW!).
mmm...NOW we're talking...
...make a lower-range gearset for the 60-series split case while yer at it....only source for those now is Australia!
...make a lower-range gearset for the 60-series split case while yer at it....only source for those now is Australia!
Doug, have you considered making a "higher" high range for the 3/4 spd transfer case? That way drivetrain length is not affected, and neither is the low range, but highway RPM's are reduced, and lots of people run 3/4spd cases in trucks that no longer use toyota transmissions.
I'm sure there would be quite a market. (myself included)
I'm sure there would be quite a market. (myself included
)
CruisinGA said:Doug, have you considered making a "higher" high range for the 3/4 spd transfer case? That way drivetrain length is not affected, and neither is the low range, but highway RPM's are reduced, and lots of people run 3/4spd cases in trucks that no longer use toyota transmissions.
I'm sure there would be quite a market. (myself included
Interesting idea - OD on the high range of the TCase. Probably couldn't go more than maybe 8% to 10% - the 60's four speed doesn't have a real low 'low', like the the H55F.
- Thread starter
- #8
So Bailey,
Your suggestion is that I leave the transmission gearing alone but instead change the "high" gearset in the transfer case (in my "case" a '77) to a higher ratio? It seems to me that would change all transmission gears to a lower numerical value thus making the engine spin slower at any speed. Wouldn't just fourth gear be the best since it generally gets used most at freeway speeds. Just askin'
Also, could you point me in the direction of the gear set that's sold overseas? I can see what they're doing.
Your suggestion is that I leave the transmission gearing alone but instead change the "high" gearset in the transfer case (in my "case" a '77) to a higher ratio? It seems to me that would change all transmission gears to a lower numerical value thus making the engine spin slower at any speed. Wouldn't just fourth gear be the best since it generally gets used most at freeway speeds. Just askin'
Also, could you point me in the direction of the gear set that's sold overseas? I can see what they're doing.
It would make the engine spin slower at any speed, but on road that would be a good thing IMO, and off road you could always drop it into low range.
A large part of the reason I was suggesting that was if you wanted to market your gearset, you could appeal to a larger set of people (myself included,) because anyone running a 3/4spd case with or without a toyota tranny could benefit.
In your case, if you are only going to make a set for yourself then your idea of the 4th gear o/d is probably a better option.
A large part of the reason I was suggesting that was if you wanted to market your gearset, you could appeal to a larger set of people (myself included,
) because anyone running a 3/4spd case with or without a toyota tranny could benefit.In your case, if you are only going to make a set for yourself then your idea of the 4th gear o/d is probably a better option.
http://www.marks4wd.com/Gearmaster-low-range-gear-index.html
There must be a distributor in the states for these somewhere
There must be a distributor in the states for these somewhere
- Joined
- Sep 28, 2002
- Threads
- 558
- Messages
- 8,122
- Location
- Kamloops, BC Canada
- Website
- www.shopraddcruisers.ca
I think Advance Adapters does and it is quite spendy.
The design of the Toyota transmission precludes a final gear ratio of less than 1:1 without simultaneously reducing the numerical ratios of the other gears. It could be done, but as Woody notes, it would be difficult or expensive compared to simply changing the R&P gears.
Also, contrary to CruisinGA's suggestion, the design of the LC transfer case precules the novel idea of having BOTH a higher and lower gear ratio out of the transfer case. Remember folks, these are only two-speed transfer cases -- you can't have it both ways :whoops:
Also, contrary to CruisinGA's suggestion, the design of the LC transfer case precules the novel idea of having BOTH a higher and lower gear ratio out of the transfer case. Remember folks, these are only two-speed transfer cases -- you can't have it both ways :whoops:
- Thread starter
- #13
I haven't guess I haven’t studied the power path through the transmission and transfer case while the trans and transfer case are both in high gear well enough I guess. Medusa, what I think that I understand you to say is the fourth gear overdrive for just the transmission wouldn't work without simultaneously changing all of the gears to overdrive? Wow, that would be a monumental task indeed 
. If that were the case then I would have to only look to the transfer case in terms of making the "high" range numerically lower. Is this possible without changing the low range?
. If that were the case then I would have to only look to the transfer case in terms of making the "high" range numerically lower. Is this possible without changing the low range?