6spd 3G tranny into my 1G?
06-05-07, 02:45 PM
#1
Senior Member
Thread Starter
Join Date: Sep 2003
Location: Richmond, B.C
Posts: 268
Likes: 0
Received 0 Likes
on
0 Posts
6spd 3G tranny into my 1G?
Can this be done? Can I mate a 3G tranny onto the 12a? Reason is I dont like sitting on the highway doing 3.5k all the time nice powerband but would like to see it lower.
06-05-07, 03:01 PM
#7
Senior Member
Join Date: Jun 2007
Location: la
Posts: 424
Likes: 0
Received 0 Likes
on
0 Posts
I Think Of It This Way If It Has A 13b And The Trans In A 13b And 12a Are Interchangeable Then It Should Work Bolt Wise. The Size Of The Trans Are What Might Not Fit In The Smaller Body Or Even The Shifter Location (not An Expert So Don't Quote Me On That)
Trending Topics
06-05-07, 04:51 PM
#12
I need a new user title
Join Date: Oct 2005
Location: Yaizu, Japan
Posts: 2,646
Likes: 0
Received 0 Likes
on
0 Posts
RIght. There's no such thing as a 6-speed FD tranny. The RX-8 has a 6-speed, but they are not all that strong. Besides, in an RX-8 tranny 5th is 1.000, same as 4th in any RX-7 tranny, but 1st-5th are close-ratio. Meaning, 6th gear is not going to bring your RPMs down much (if at all) at highway speeds; you're just going to be shifting more often at lower speeds.
06-05-07, 05:29 PM
#13
Junior Member
Join Date: Jun 2006
Location: Canada
Posts: 18
Likes: 0
Received 0 Likes
on
0 Posts
RIght. There's no such thing as a 6-speed FD tranny. The RX-8 has a 6-speed, but they are not all that strong. Besides, in an RX-8 tranny 5th is 1.000, same as 4th in any RX-7 tranny, but 1st-5th are close-ratio. Meaning, 6th gear is not going to bring your RPMs down much (if at all) at highway speeds; you're just going to be shifting more often at lower speeds.
x2
rx8 6th gear is 0.84 and fb 5th gear is 0.758 and 0.807 for SE. You will be shifting more often and won't get better gas mileage or lower rpm on the highway.
Frank
06-05-07, 06:20 PM
#15
Senior Member
Thread Starter
Join Date: Sep 2003
Location: Richmond, B.C
Posts: 268
Likes: 0
Received 0 Likes
on
0 Posts
At 3800 rpm im at just over 80mph or just below 140km/hr. So how would I go about getting just a taller fith gear in my stock gearbox easy to do? where can I get them? any suggestions would be great.
06-05-07, 06:28 PM
#16
I need a new user title
Join Date: Oct 2005
Location: Yaizu, Japan
Posts: 2,646
Likes: 0
Received 0 Likes
on
0 Posts
06-05-07, 07:21 PM
#17
A T2 tranny will do what you want, it's really strong and is much taller in the upper gears. It is also the easiest to mate to your FB. There are several threads explaining how. You mate your 12a tranny shifter housing with slight modification, to keep the shifter in the stock location. You will need to modify the
T2 drive shaft to fit the rearend. A local shop should do it and balance it for about $100. I beleive you need the clutch and flywheel from the T2. Other's who have done this can confirm.
Good luck
T2 drive shaft to fit the rearend. A local shop should do it and balance it for about $100. I beleive you need the clutch and flywheel from the T2. Other's who have done this can confirm.
Good luck
06-05-07, 10:13 PM
#19
FB+FC=F-ME
The TII tranny is solid,they used it in F-150 full-size trucks! Its quite over-built for a small 2 seat sportscar. Many FD guys swap to a TII box for this reason.
The RX-8 may have a 6-speed (big rip).....but the Renesis also has sh*t for torque,so its likely that the ribcase box the 8 uses,isnt on-par with the earlier Type R boxes.
If you like shifting and are short on torque,then get the 6-speed.
If you have enough power to justify a TII tranny......you dont need 6 gears!
The RX-8 may have a 6-speed (big rip).....but the Renesis also has sh*t for torque,so its likely that the ribcase box the 8 uses,isnt on-par with the earlier Type R boxes.
If you like shifting and are short on torque,then get the 6-speed.
If you have enough power to justify a TII tranny......you dont need 6 gears!
06-06-07, 01:43 AM
#20
The 86-92 N/A transmissions have the tallest 5th gear there is at .697.
That is what I have in my 85 SE and at 80MPH with the stock gears of 4.076 I am only around 3100 rpm at that speed. I believe at 95 Mph I am around the 3800 rpm range.
The 86-88 N/A trans would be the easiest to install if you want the tall 5th gear.
You only have to swap out the shifter housings between the the 2 and installl. There are no other mods.
The only thing depending on how your engine is. Meaning stock or modded. 5th
gear at 55 Mph would be somewhat boggy and not have alot of available power. You would be keeping it in 4th uphills or have to downshift to 4th on the freeway at speeds of 65 mph or below to gain some momentum.
To really use the 5th gear on the freeway I would presume that your average cruising speed would be 70-75 mph.
06-06-07, 07:54 AM
#21
1st...2nd...3rd...4th...5th...Don't make me go into R on you!!
I just wanted to mention that you shouldn't assume that because a tranny bolts to a 13b that it will bolt to *any* 13b. The bolt holes may match up, but the clutch assembly and fork aren't always the same. The Rx8 I believe uses a "pull-type" clutch.
Jon
I just wanted to mention that you shouldn't assume that because a tranny bolts to a 13b that it will bolt to *any* 13b. The bolt holes may match up, but the clutch assembly and fork aren't always the same. The Rx8 I believe uses a "pull-type" clutch.
Jon
06-06-07, 08:33 AM
#23
Burning Oil-Grinding 3rd
