thanks a bunch guys, the 13B I'm going to use is out of a 2nd gen Its a 86-88 not absolutely sure. I guess I will use my FB tranny but man I'll say it again I love how the 2nd gen tranny is geared but I don't want to have a heart attack trying to install this 13B........ Oh **** I remembered another question which header should I get a GSL-SE header or a 2nd gen header. https://www.nopistons.com/forums/pub...1047683473.gif

1) Get an SE Header, it's going in an FB, remember?



2) The 2nd Gen N/A Tranny isn't *that* much better.



By the way, the Best FB combo EVER for highway cruising, was the bone stock 1985 GSL-SE.



Swapping for a TII Tranny will only be a better ratio than a regular FB, but not an SE.



For THE Absolute best low RPM cruising, an Second Gen GXL tranny would probably be best, to an FB rear end..





So according to these numbers, my TII Tranny and SE rear end would give me a final drive ratio of 2.931, slightly worse than my stock configuration, but worth it for the strong tranny.



Also note that the tire size, diameter will have the same effect as changing the gears, so a rim/tire combo will yield better cruising RPM as well.

<span style='font-size:8pt;line-height:100%'>



US SPEC MAZDA DRIVELINE RATIOS



*** FIRST GENERATION ***

……………………………………………………………….…….………………………………..AXLE..FINAL.TIRE......TIRE..ENGINE

VEH.. YEAR. 1ST.. 2ND...3RD.. 4TH...5TH...RATIO RATIO SIZE……....RPM...RPM @ 60 MPH

RX-7. 79-83 3.674 2.218 1.433 1.000 0.825 3.909 3.227 185/70-13 892...2878

RX-7. 83-83 3.674 2.218 1.433 1.000 0.825 3.909 3.227 195/60-14 891...2875

AUTO. 84-84 2.458 1.458 1.000 0.720 N/A...3.909 3.909 185/70-13 892...3487

GSLSE 84-84 3.622 2.186 1.419 1.000 0.758 4.083 3.097 205/60-14 878...2719

RX-7. 84-84 3.622 2.186 1.419 1.000 0.807 3.933 3.175 185/70-13 892...2832

RX-7. 85-85 3.622 2.186 1.419 1.000 0.807 3.909 3.156 185/70-13 892...2815

GSLSE 85-85 3.622 2.186 1.419 1.000 0.715 4.077 2.914 205/60-14 851...2480

RX-7. 85-85 3.622 2.186 1.419 1.000 0.697 4.444 3.099 205/55-14 910...2820



*** SECOND GENERATION ***

……………………………………………………………….…….………………………………..AXLE..FINAL.TIRE......TIRE..ENGINE

VEH.. YEAR. 1ST.. 2ND...3RD.. 4TH...5TH...RATIO RATIO SIZE……....RPM...RPM @ 60 MPH

Base. 86-91 3.476 2.002 1.366 1.000 0.711 4.100 2.917 185/70-14 855...2494

GXL.. 87-91 3.476 2.002 1.366 1.000 0.697 4.100 2.859 205/60-15 841...2404

Turbo 87-91 3.483 2.015 1.391 1.000 0.719 4.100 2.948 205/55-16 828...2441

Conv. 88-91

GTUs. 89-91 3.476 2.002 1.366 1.000 0.758 4.300 3.261 205/55-16 828...2700



*** THIRD GENERATION ***

……………………………………………………………….…….………………………………..AXLE..FINAL.TIRE......TIRE..ENGINE

VEH.. YEAR. 1ST.. 2ND...3RD.. 4TH...5TH...RATIO RATIO SIZE……....RPM...RPM @ 60 MPH

(FD). 93-95 3.483 2.015 1.391 1.000 0.719 4.100 2.948 225/50-16 829...2444



</span>



Man, you're not gonna believe how long it took me to get those aligned and looking right on the screen.. :tear:

Holy **** ask Mr. wizard thanks alot man by the way do you know how a nuclear reactor works. just kidding dude you definatly knwo your **** props to the rotor god https://www.nopistons.com/forums/pub...1047683894.gif









P.S. how all you northerners loving that snow and what not, man I love forida. https://www.nopistons.com/forums/pub...DIR#>/cool.png

Lets just say me and DF have been there and done this to previous cars.Right DF? https://www.nopistons.com/forums/pub...#>/biggrin.png I love my 13B NA swapped 83 with a big ol webber

Sure,



Why Not.



http://static.howstuffworks.com/flash/nucl...wer-reactor.swf

https://www.nopistons.com/forums/pub...1047683621.gif From J to I where does the water go.