Hi,
I am new here I have a gearbox question,
I'm currently building a street 2110cc engine. It has short rods and should make a good amount of torque to make it a fun daily driver and sometimes I would like to take it down the strip.
I currently have a 1600cc engine in my 1200 gearbox. I think it's an AB code the gears feel way too close together and I don't have much top end speed. I've been told to use 1303s internals for my build but I wanted to get a good understanding of the best way to go about it.
My tyre size will be 195 60 15
My current thoughts are using 1303s internals into my swing axle gearbox. Weld 3rd and 4th gear to the carrier and add in a super diff with 4 10 tooth spider gears. Does this sound like the best thing to do to keep it from breaking from the torque?
Thanks
The new guy
2110cc torque engine gearbox advice
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- Posts: 166
- Joined: Sun Nov 17, 2013 6:42 pm
Re: 2110cc torque engine gearbox advice
You want the 3.78 first, you can use an 091 idler for first as well to make it sronger. You will need to machine .014 or .018" off the back side of the gear thrust face to do the conversion and then use an 091 synchro and 091 slider as well.
Here is the US the later IRS boxes came with fine tooth 3rd and 4th, you strike me as being from Europe as that's the guys typically calling out 1200 and 1303s. The 10/15 tooth super diff for a swing axle isn't available here in the US, the side gears here in the US were imported from Europe. I know Weddle might still have some stock on 15 tooth side gears, but you might be better off with 11/17 as the parts and super diff are available. The last sets of 15 tooth side gears I got were not pretty, but you can find some here and there if you look hard enough.
If you go super diff on the swing diff, you would be good to do some oiling mods. I did the oil mods to the side covers like hte factory did for the ZF diff and then opened up areas of the diff housing as well. I don't do a lot of swing boxes, but looking bad wish I would have made the scoopsin teh diff more about getting oil to the center area as teh side gear slots don't always align to the openings enlarged in the housing for oil to make it to the fulcrum plates. He's doing great with teh trans though, my guess is the combo of the housing mods and the side cover mods allow him to do fine on the highway as he's a big highway driver.
You 3rd and 4th will have to be converted to do on with the late model shaft if they are 113 gears. Typically these get welded and then a front portion bored out and the 3-4 hub center turned a little to make them fit together. You also get conversion washers for this from Weddle to take up the spacing as well. The last trick is narrowing the 3-4 hub and using 091 clips to lock it in place. I do a little extra room on the 3rd gear side so you can get the 4th gear clip on and then press the hub towards 4th locking it on the clip so it's where it will eventaully want to move to anyways when you set end gear spacing and the fork.
The 002 mainshaft bearing flipped so the plastic cage is held in place and using the thrust washer is better than the 091 bearing. Hard thrusts or pops can sometimes dislodge the cage and I also think the thrust washer bends more were the 091 bearing with that integral face will do micro welding and hardening and make a mess of stuff.
Add the more common stuff like heavy duty side cover on the thrust side and chromoly pinion bearing retainer and somethign to take the thrust of the large mainshaft bearing. I like the Bruce plate a lot, but the thrust plates work as well although require a lot of silicone or other sealant instead of a gasket for the nose cone.
Here is the US the later IRS boxes came with fine tooth 3rd and 4th, you strike me as being from Europe as that's the guys typically calling out 1200 and 1303s. The 10/15 tooth super diff for a swing axle isn't available here in the US, the side gears here in the US were imported from Europe. I know Weddle might still have some stock on 15 tooth side gears, but you might be better off with 11/17 as the parts and super diff are available. The last sets of 15 tooth side gears I got were not pretty, but you can find some here and there if you look hard enough.
If you go super diff on the swing diff, you would be good to do some oiling mods. I did the oil mods to the side covers like hte factory did for the ZF diff and then opened up areas of the diff housing as well. I don't do a lot of swing boxes, but looking bad wish I would have made the scoopsin teh diff more about getting oil to the center area as teh side gear slots don't always align to the openings enlarged in the housing for oil to make it to the fulcrum plates. He's doing great with teh trans though, my guess is the combo of the housing mods and the side cover mods allow him to do fine on the highway as he's a big highway driver.
You 3rd and 4th will have to be converted to do on with the late model shaft if they are 113 gears. Typically these get welded and then a front portion bored out and the 3-4 hub center turned a little to make them fit together. You also get conversion washers for this from Weddle to take up the spacing as well. The last trick is narrowing the 3-4 hub and using 091 clips to lock it in place. I do a little extra room on the 3rd gear side so you can get the 4th gear clip on and then press the hub towards 4th locking it on the clip so it's where it will eventaully want to move to anyways when you set end gear spacing and the fork.
The 002 mainshaft bearing flipped so the plastic cage is held in place and using the thrust washer is better than the 091 bearing. Hard thrusts or pops can sometimes dislodge the cage and I also think the thrust washer bends more were the 091 bearing with that integral face will do micro welding and hardening and make a mess of stuff.
Add the more common stuff like heavy duty side cover on the thrust side and chromoly pinion bearing retainer and somethign to take the thrust of the large mainshaft bearing. I like the Bruce plate a lot, but the thrust plates work as well although require a lot of silicone or other sealant instead of a gasket for the nose cone.
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- Posts: 8
- Joined: Mon Jan 18, 2021 1:45 pm
Re: 2110cc torque engine gearbox advice
Thank you very much for this information. This will be very helpful! I really apreciate the advice!