Identify This Box.

[1600dave]

So, picked up a box off another member, mainly because it looked interesting and on the off chance it was an "Option" box.

 

71B type box, has flange output like a 71A, has a rear extension housing that looks the housing on an Option box, appears to have steel synchro's and has a steel sandwich plate. So far, so good.

 

However, it is a normal "H" pattern box with an overdriven 5th gear. Ratios seem to be around 3.3, just over 2, around 1.3, 1 and .85.

 

Only other feature is "7613318" stamped into the rear extension housing, although this looks to me to not be an original marking.

 

Anyone with any idea what it actually is ? Closest match I can find is an FS5C71B Wide ratio Option box, part number 32010-N3030.

 

If it is indeed this box, why / where would it have been used ? What benefit does it offer over a 240K / Bluebird box with similar ratios ?

 

 

 

Edited April 22, 2018 by 1600dave

[gav240z]

I've seen this style of rear flange 71B box fitted to a Fairlady Z (72 model w/L20A). Not sure if it was original or not however.

[1600dave]

My intention is to put it into a Fairlady, but not a Fairlady Z. It will most likely get a diesel bellhousing to go behind the R16 in one of my fairlady convertibles.

[1600dave]

Actually, one other question - anyone know the dimensions of the bolt pattern on a 71A output flange ? 

[dat2kman]

You'll need a bell from a H20 engined Urvan/E20.

It will be longer than the four speed from the SP311, the stock bx mount wont line up with the B ext housing, ver the X frame, needs a bit of fiddling about.

Have seen stock mount metal bracket with rubber sandwiched wteel sed, also the frward bottom f X frame, holesaw drilled out from under side, two bits of 1" diam tube welded in, and two early holden radiator mounts between gearbox ears and top of X frame.

If you need a flange to flange slip jointed tailshaft, I have a couple spare.

 

Oh, and do a proper count of the box, i reckon its a Rally version of the Option boxes, they were used in the endurance event/Safari rally type cars !

[1600dave]

Will check out Urvan bells. I've been led to believe SD diesel bells will also do the trick behind an R16, but not 100% sure.

 

I'll do a proper check of teeth tonight. Reason I bought it was because the only boxes I've seen with flange output and that style of rear extension are Option boxes, thought it was worth a gamble. Definitely not a 1:1 5th gear Option box though, 5th definitely overdriven

Edited April 22, 2018 by 1600dave

[cracker]

It's entirely likely (and perhaps the most simple answer) that the flange output was a modification so that the later style box would fit an earlier car, without having to source a new tail shaft and rear end setup.

[HS30-H]

I'll do a proper check of teeth tonight. Reason I bought it was because the only boxes I've seen with flange output and that style of rear extension are Option boxes, thought it was worth a gamble. Definitely not a 1:1 5th gear Option box though, 5th definitely overdriven

 

Just about every E87 type FS5C71B 'box fitted to S30-series Z cars sold in the Japanese market had the flange type output.

 

When I asked why - a long time back now, and my question relating specifically to S30-series Zs - I was told that it was to align the S30-series transmissions with those fitted to Japanese market Skylines, Cedrics, Glorias et al, which always had flange type output too.

 

So this transmission could easily be from a Japanese domestic type model, and may well have arrived in Australia as a used part.

[1600dave]

Interdasting, quite plausible given the number of tranny's brought in from Japan back in the day. When I converted my brother's 260Z 2 seater from auto to manual in the late 80's the Jap importer I got the box from in Sydney had 5 speeds stacked 10 high, although I don't recall seeing flange ones. Although it was a while ago......

 

The one we used in my bro's was slide in shaft. May just have been what the importers ordered though, probably not much market for flange boxes in Australia given all our cars were slide-in (except early zeds and roadsters).

 

Ahh well, another box to add to the collection in the shed  :

Edited April 22, 2018 by 1600dave