oh, and PS

if the rear of the gearbox has ended up in the stock location then you can choose 2 piece tailshafts from the b2600 range which use a piston adaption of the t2 gearbox

if things have changed and you need a custom tailshaft then you may also wish to install a t2 diff head
as this is long nose and shortens the need for the two piece tailshaft
( when it is over a certain length, mazda chose the two piece to avoid the limits of tailshaft critical speed )

with the long nose " tq tube " diff setup then you can get a decent single shaft
( 3 inch thickwall with 1310 or equiv mopar uni joint )
made up that will be much cheaper than making a double
( and safer than modifying your current double )

the trick with using the t2 diff in the semi floater diff tube is to weld washers onto the end of the axles to make up for the change in lengths
now that the new t2 diff lacks the support in the middle of the 'rubbing block' found on the old b1600 diff spider pinion shaft

ie.. the axles are supposed to rub on the spider gear pinion shaft "rubbing block" in the b1600 diff
so as to share the weight load across the two opposed taper bearings at each axle end

when you put in the t2 diff ( ex IRS )
.. it lacks the rubbing block width
and so makes setting the endfloat for axles impossible
till you add washers to axle ends so that they rub on the t2 spider gear pinion shaft

the trouble is worth it,, as it brings the option for LSD
,, and much simplifies the fabrication and cost to a single piece tailshaft

Got to do some work on the truck yesterday.cleaned and sanded down the chassis and got it painted.

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And installed it's new heart ��

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Managed to get some more work done to it.i had a 86-91 rx7 13b header that I modified so it fits the tight engine bay on the truck.also got a fd upper intake manifold ported so it bolts up directly to the s4 turbo lower intake manifold.got some dual radiator fans mounted also.heres some pics

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3 row rx7 Radiator was a tight fit but got it in there.also had a radiator shop change the bottom outlet and also put the heater hose outlet on driver side.

Looking good Dave. Just saw one of these for sale up here. If I didn't have the REPU already. I loved to have one.

It's getting there slowly.
Wired up the rx7 ecu onto the b1600 and just need to finish little things here and there and it should be ready to fire up soon
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damn...not sure how i missed this thread...sweet truck and now its going to be even sweeter once TurboDave is done with it.

Updates also on this
Truck is up and running
Just need to do the exhaust
Doing 2.5" stainless steel pipe,racing beat universal pre silencer and racing beat universal muffler out back.
Here's A video of first start up

Nice job, how's it looking now?

mazda b 1600
 

c'est un beau projet bonne continuation
ou est ce que je peux trouver le pare prise pour ma camionnette sur le net

Translation:"it's a nice project good luck or is it that I can find the spark plug for my van on the net"

www.rockauto.com

Really nice truck. Anything to update with it?

Turbo_dave I have been following you on instagram for about a year now. You do a ton of old school rotary stuff, I love it way more than bolting shit on FDs as you normally see on social media.

Keep up the good work!

Really sorry to dig this thread up, but i was wondering if i could pick your brain a bit about this project, Dave.